I can't imagine owning every game for a console. I collect old games and my SNES collection is my favourite. I collect the GOOD games and I still have some rare ones left to get. I've never had any desire to also collect the bad titles. It just seems unnecessary. Playing these games is part of the experience and why would I want to play Awesome Possum or Mr. Nutz? If I somehow became rich the only change would be that I would try to get the box and manual for every game in my collection.
I doubt anyone would pay over a million for a videogame collection if they were only moderately interested. Who would pay that kind of money to let this rot in their basement?