Absolutely right, there are many different types of buyers out there. Some people just want to have a kickass game collection, especially if they're a bit older and have some space like a mancave, or office.
I know plenty of people who sold their games, and consoles to pawn shops back in the day, as the newer consoles came out and the older ones had been gathering dust, now though, many people want to go back and replay some of those older titles.
I just put everything up for as fair a price as I can, and slightly less than what the games are selling for and leave them. I've had games sitting there for 2 months with barely any views even, then I wake up one morning to see they sold. It just depends on when someone out there wants it and starts searching for it.