"Amazon apparently has a plan to warehouse the discs and ship for you. Anyone tried that?"
Amazon fees are very expensive. Unless you have CD's that sell for a lot of money, you'll just be giving them away. I would not be so fast to sell them anyway. People find out that they didn't rip their CD's properly and have to go back and redo them all the time. Also, not everyone likes computer audio. Keep the CD's for at least another year or two.