I think I'm gonna sell all of mine on Ebay. I have from 12/94 to around whenever it got all fucked up in 2001. I wonder how much I could get for them?

Sometimes, when I put a CMJ disc in my player, it will read THIS CD IS TEMPORARILY UNAVAILABLE.

It depends on how you sell them.
The earlier ones (First 20 or so) are worth more. (So if you break them up into smaller lots, you'll probably make more money than if you sell them all at once, because people won't want to be buying ones they already own.)
I have them all, and I paid probably on the average $2 for the ones I needed to fill my collection. I had to buy some lots of them, but then turned around and sold my duplicates to cut my expenditures.

I think I have about eight to ten left that still play. I have gotten the Instore sampler discs from CMJ from local record stores a couple times in the past few years, but haven't gotten a monthly CMJ mag disc since Radiohead came out with Kid A or Amnesiac.