It's steep because 99% of every SNES and Genesis game are already available in ROM format anyways.
Granted it is neat and I think it would be cool to have one just because the thing exists. But to slap down $100 for it? I dunno, If it was some sort of open source project where I could assemble and build the thing myself, then it might be fun.
It's just a matter of being a little late in the game.