Maybe that says more about your retail store.
There is a huge difference between who is interested in old Nintendo games and in old Atari games. I LOVE Nintendo, and yet, even having sampled chunks of it, the Atari 2600's software library never spoke to me. I know I can't be alone.
Also, which retro platform are people actually talking about by the hundreds on YouTube? Not Atari so much. If anything, Atari is the butt of the jokes, with AVGN "pooping" on the Jaguar CD and storing Rolling Rock in the back of the 5200.
So yeah, normally I'd say that Orbital Beard's demographic data is correct, but Nintendo as a brand and a retro identity extends well beyond Atari's, Intellivision's and Coleco's. So yes, the 40+ will buy the NES unit for sure, but younger people will ALSO pick it up.
All of that said, the Amiibo thing is a dumb idea and makes no sense. What is it supposed to do? "Add a game by tapping an Amiibo"? Okay, if it's an unlock of an onboard "hidden" game, but you can wipe the Amiibo's data, so you could pass the figure around to friends and unlock that same game for dozens of people without them paying for it. And you can't put the game on the Amiibo because they hold less than 8 kilobytes, and 8 kB is the smallest NES ROM size. So you'd be asking them to A) include an NFC chip in the NES Classic device AND B) increase the Amiibo's storage space and C) implement a first-user-only system for the amiibo, insanely reducing their resale value (no one will want
many of them after they're done unlocking the game). I mean, it just doesn't really hold up dude. This is not a platform they are trying to grow, it's a cash-in. A
nice cash-in, an
inexpensive cash-in, but a cash-in.
Edit: Literally the only thing I can think of that is feasible is if they have select existing Amiibo unlock new UI/menu graphics that are already coded on-board but not available until their matching game is beaten or the Amiibo is used. Or maybe only for the Amiibo. I don't know. Honestly, it's just not that serious.