My wife is great, she'll purge the old ones for me, because she knows that I can't put them in the trash... I always think I'll go back and read them, and never do. To me, they really just take up space. If I need information, I just research it on the web, much more efficient.
I have never seen any real monetary value to them. And they're like anything that you want to sell, you need to have ready buyers. Even then, how much are you really going to get...?
All this reminds me, I need to cancel my gun magazine subscriptions?