All if those are worth that price too
Absolutely. For all of the advancements in graphics and sound in current era games, there was something really meaningful about bringing home a cartridge- it was much more tangible, for lack of a better term, than games on disc. I'd take a cartridge based console over anything else even today. I'm not even a strict retro gamer. It was just better then.
When you spent that much on a game, with the packaging of that era and the cartridge, it really felt like you got your money's worth. You knew right away that you have something of value, and it would be valuable for a long, long time. It was special. Having Ogre Battle was a cool thing- it was a valuable game to own. Now, we just cycle through discs like they're nothing, or not even care about lasting value at all and just buy a download.
If a console like the SNES came out today, and a cartridge game like Ogre Battle was on the shelves for $100, I'd be happy to pay that. I'd even pay Neo Geo cartridge prices.