This makes me want to jump in. But also, I wonder how many people will ever buy and play your game.
Does Modretro's target market buy this type of stuff? Or are they the type to just download and emulator and ROM.
Speaking as someone who spent all weekend playing his new M64: Yes, the target market often does buy the cartridge. I've got a brand new copy of Xeno Crisis sitting on my shelf, although Xibalba was a close 2nd. (Tied with Buck Bumble ;) )
That said, there's definitely a crowd that would rather buy a summercart and pirate all their roms. Personally, I'm interested in more thoughtful and intentional electronics, so I'm attracted to the idea of old school "buy the game on a cartridge" mentality.