I never sell games. I don't sell a game unless I absolutely didn't like it, it has no nostalgic value to me, and I would never play it again. Replay value is important to me, so I like to have hard copies of games and be able to play multiple times. I'm also a bit of a collector. Not a hardcore collector, but I like to have things, especially when later in life, most people no longer have it and I'm still sitting here holding on to it. Lately I've gotten into boxes and manuals, and it kills me that I lost all my N64 manuals (threw the boxes away, dumb kid) during some moves when I was younger.
As for consoles, I never sell consoles. Those are the main hub to play the good and bad games. Why would you EVER get rid of that? Even crap like the Atari Jaguar and the 3DO that you probably wouldn't wanna play...just to say "hey I have a 3DO remember that ****?" would be awesome for a nerd like me. Not gonna go out and buy one, but my point still stands. Selling games is more understandable than selling the whole console, though.
Besides, I've got kids and grandkids to educate in the far future. You can't do it properly without an N64!