There are folks out there, generally not 'us', as in the typical member of AA, where the collectible factor is the HIGHEST reason to possess a rare game. It's the same types of folks out there who collect coins, or art, or other things that gain (not simply retain) value.
In the stores near me, pretty much all of the titles are relatively expensive...except for games that were so mass produced (sports games, for instance, on PS1, or games like GTA3 on PS2) that you might find them at around 7 or so bucks. This all took off not too long ago. But isn't it interesting that, much like any other collectible, retro games need, outright NEED a widespread audience in order to be collectible. Case in point, just take a look at how much the mini NES and SNES are going for on ebay. Hundreds of dollars. More than, in most cases, the systems themselves. Now this is easy for me to accept, because a) it's not so easy to play those games on those systems unless you have an idea about multicarts and b) because the general PUBLIC has deemed that stuff interesting, creating demand, demand further spurned by a manufacturer who is reluctant to produce said product in the amount to satiate demand. And like the fellow above said, in the case of the Wii U, it's not completely out of the picture to imagine that Nintendo did that on PURPOSE, so that they could still sell their Wii U titles for full price almost a year after the system was discontinued! It makes great business sense, actually.
But pisses us off who looked to this retro hobby as generally a cheap way to get some fun (and nostalgia, too).
As far as other bubbles, I can't speak to the NASCAR products...I have no idea about them. But just about everybody knows about the NES, and that will continue for quite some time. About the only way it will reverse course is for, as another poster noticed above, those that are collecting this stuff literally die out and the fans who remembered those titles also die out. Then, and only then, will you see those high prices drop.
I consider NES games (and SNES, even more so) like vintage guitars: only the oldest, best condition instruments command the extreme top dollars from collectors...and it took a few decades to get that way. But even then, eventually, the majority of those instruments will lose value if not only because nobody cares anymore. That's already happening and has been happening with rock for quite some time, but that's another conversation. Your 50s Gibson Les Paul is like the MISB SNES from back in the day, along with a MISB copy of Chrono Trigger. The demand is just crazy high for that and video games, not Nintendo fans, will ensure that will be the case for future decades. Only if video games themselves start to lose popularity will the trend reverse (like the modern day erasure of rock music being the most popular form of music for young people), but even then, there will still be those very rare specimens. The valleys will be followed by peaks, much like vintage guitars, but once it reaches a certain height, it's pretty sure that's where it will stay. Stradivarius violins, an extreme example, but you get my point.
At some point, most of the stuff we see that's high in price will simply drop if only because nobody will give a shit anymore. Snow Brothers for NES will not always command 400 plus USD because people will not give a shit anymore. We'll all be old farts, pining about the old days, lol...and there simply won't be enough of us to instill that 'demand' for those kinds of titles.
Comics, baseball cards...the top stuff will keep its value, as it always has (and will). And relatively speaking lots of stuff from the 70s will still keep its value if it was popular and is in good shape. But you won't be retiring off it, which is what speculators would want to occur.
I'm not sure how long the 'bubble' will last but probably with the demise of retail stores that specialize in retro games...but then again, there's always ebay. I mean, that's where these stores are getting their ideas about how to price their items in the first place. Part of me wonders why all this didn't happen sooner!...and I kick myself for not picking up some absolute gems along the way when they were reasonable (30 bucks for CIB Bart vs the Space Mutants, 20 bux for CIB Earthworm Jim on Genesis, likewise for Gunstar Heroes). I'm a collector, but I want to play this stuff. There are no sealed games in my collection.
To end my rant, lol, I'll show you that sometimes I'm more foolish than I let on: about ten years ago, I bought a sealed copy of Micro Machines for the NES. I loved that game, and at the time I had no interest in emulation (much like today, to some degree). I paid about 55 USD for it in 2008. Opened it up, had some annoying problems with the lockout chip (I was using a newer NES console) but still had a lot of fun. A quick boo at the completed ebay sales show that title recently sold for around 200 USD, so it quadrupled in value for a sealed specimen. Eight years, quadrupled value. A complete in box, like what I now have, goes for around the same price I paid for it back then. My point...this stuff isn't going to really add much to a retirement portfolio (as we all well know). So I got to enjoy the game, but these days I play it on my powerpak. So while it retained some value, I wasn't about to hold on to it sealed in order to sell it...in order to do what, buy more games? I dunno. Will games like Snow Brothers keep holding their value? I dunno. Those two games, they're both sleepers but for some reason people want them as collectibles. I don't know where it ends.
Is Chase the Chuckwagon still selling for crazy dollars? And that stuff is going to take the first hit when the 'bubble' pops, because only we care about that stuff. I can't see a situation where that game continues to hold value once guys like us are dead and gone. Or maybe it will? Shit, my local shop is selling Dukes of Hazzard for the Coleco for 40 dollars!...loose! Yes, it's in immaculate shape, but still: that game is horrid, and the only reason they're asking that price is because of ebay, because of the IP. That's it. Space Fury is 25. And I'm fighting the urge to pick it up But those games should be no more than ten bucks each...and that's even being generous.
Good PS1 games are holding value, even the PS2 is rising: and this, only two Christmases after a 'take home ten for five bucks!' sale that I picked up a big chuck of my current collection of those nostalgic titles from the system...the stores need floor space, and that got them moving. Only to be cleaned up and put on ebay for triple the price!...and then what stock remained in those shops?...went UP, of course. The whole thing is almost comical.
Stay retroing, my friends.