why don't people who develop for the Jag try for something great? I'm not being a hater , but (oops!) these homebrews are not exactly pushing the Jag hardware, not even a little bit.
Nothing is stopping you! go for it!
What would you consider 'pushing the Jag hardware' ? And what is the point? People pushing the fun is much more preferential, be that for them or for the people playing/using what they produce.
Also these homebrew devs (myself included) don't do this as a job, this means it can take quite a chunk of time to get something done, even what you may consider a simple game can take months. I have been working on just my Sound Engine for months, it has a long way to go still, and that's just code to make noise! You also need code to draw the screen, and manage the gameplay, you need to tweak things like gameplay to make it fun, which can be a lot of small tweaks and adjustments. Even just looking at the code, writing, testing, debugging for a simple project can take a single person an age.. not even including graphics or sound or other game content in that.