If I was gonna quit Gaia, I'd probably check my friends' wishlists and give them what they wanted that I had. Everything else...well, I'd probably donate it to a charity or something so it didn't go to waste. Might even start my own little charity/giveaway. Then again, that might cause me to not leave, so it'd probably all get given away in one huge bang.
I am a packrat, so I'd probably be a couple weeks trying to give stuff away.