I don't think they're worth much anymore. I, too, collected comic books and cards in my elementary-middle school years. Back then according to Beckett, any Michael Jordan card would be worth at least $1 instantly.
I've been trying to get rid of some of my collection for a a while too, but there seems to be no market for them. I tried to go back to the comic book stores I went to as a kid to buy these stuff, but they all went out of business, lol.
I guess I'll just keep it and pass it on to my kid(s) or something.