Ach. Missed it.
I too would gladly buy my favorite games from my childhood...
But wait a sec, let's see, I did already. I paid the $50 for Super Mario Bros 3 the day it came out, and another $50 when I thought the plastic box it was enclosed in was failing, before discovering it was the NES player itself. So I do own it, two copies of it, even. Just because the NES broke, doesn't change the fact that I still legitimately own two copies of the game SMB3. ...whether enclosed in an unusable plastic box with no machine available to play them, or moved over into a folder on an iPad where they're usable. Either way, I have paid asking price from everyone involved, and stolen from no one.
So Nintendo telling Apple that I shouldn't be allowed to play my expensive game on modern equipment, when clearly it is technically possible as evidenced by apps like these, and Nintendo provides no alternative product that allows me to use my purchased games, and I'm not making copies of it for others & thus taking away from their sales (if they even sell it anymore), seems unethical, and does not make me want to purchase further products from them.
