I wouldn't say worthless (not like you have some Chumbawumba or Shania Twain CD's

) but you are certainly not going to get anything from a store or dealer, they after all have to mark it up to make a profit. I was quite surprised when I did a record show and brought a few boxes of CD's on a whim, there definitely are people still collecting them, didn't sell a huge amount but a few did move - heck, even cassette tapes are apparently coming back so why not! For something fairly specialist and collector oriented like the Pressure Sounds catalogue I would say Ebay/Craigslist etc is the way to go if you have the patience to list it all (selling as a bulk lot could attract some interest).