Not saying you shouldn't collect stuff. I just don't understand wasting a fiver on it. Make friends with someone who went/is going to the gig and I'm sure they'd just post one. But hey, if people want to waste money on such things, go ahead.
But you can dry yourself with a towel What can you do with a muso?
(I get wanted to have one, I don't get actually paying to get one. But then I also don't get paying for Muse baubles or other overpriced bits of plastic with a logo on it)