So, I've Been Thinking About Selling My Game Collection...

Around sometime last month, I went through the 400+ games I own one by one and asked myself  "am I ever going to play this again?" For about 95% of those games, the answer was no, and ever since I've been contemplating my reasons for keeping them. I've had some of these games for so long that I just think it might be time to let go of them and hopefully let somebody else get the same amount of enjoyment from them as I have.
I'm curious to know if anybody reading this has sold their video game collection before. If so, how did you go about doing it? Any advice for a guy who's never sold anything on eBay before? And most importantly, did you have any regrets afterwards?