I have every Yu Gi Oh card from the first season to the end of the GX series and don't know what to do with them. Any ideas?

well you could sell them on ebay or something or save them and put them out of site like your basement hoped i helped

Give them to me (or at least all of your bugs, pyros and dinosaurs)! = D But ebay or any other auction website is a good option. If you have a swap meet or something locally, you can also sell them there. Or you could donate them to Goodwill or any other charity organization.

Since they ARE collector's cards, though, I'd keep and display them. Use them. Maybe start a trading service.