The problem with buying concert tickets online is that you have to give them an e-mail address. Then they endlessly send you spam in the guise of music recommendations for upcoming shows. This might be a useful tool if it were always going to see bands that I was really interested in, but I'll occasionally buy a ticket to see a show with a friend or at the behest of my girlfriend. And now I'm on the Third Eye Blind mailing list. Some complex algorithm has taken into account all the shows I've gone to, and it's determined that I'm likely a fan of pop band Third Eye Blind. I don't know who wrote the software that makes music recommendations, but I'm guess that it's a guy with a bit of a Third Eye Blind bias.