Hey, I just saw this. I'm probably not doing enough reading.
Concerning sales figures? Well, I'd guess the system is as good as dead (, at the moment). It really could use a couple of attractive homebrew games. Derek, great that you put time and effort into that console again.
I sold maybe 25 INTERTON-adapters and 15 or so 1292-AVPS-adapters. Not much going on. Maybe one order every six weeks. Just a few people, who still have some childhood memories, from all over the planet. The different 1292-families do not make it easier to cover demand. Everybody wants his special format to be covered, of course. I focussed on the two families, which I considered to be the biggest.
Yes sure, multi-cartridges are not what real collectors are fond of. They want original hardware, boxes and booklets. But multi-carts are great, to check out a system or to save storage space in the appartement.