I just sold a couple of OLD concert tee shirts on eBay. One was a Jane's Addiction shirt from the late 80s and that went for just over $20. But the real kicker was this Red Hot Chili Peppers concert tee shirt I got at their concert back in 1990. This old thing has multiple holes in it and the fabric is thinning. I took pictures and also described how many holes and their sizes and location on the shirt. I honestly didn't think I'd even sell it. But sell it I did, for a whopping $66!!!! I could not believe it!
Man I love eBay. Wish I had even more stuff like that. What I have bought will hopefully net me some profit, but I think that was a real rare occurance. :)