Why doesn't anyone do anything about ticket brokers?

I wanted to go see Bon Jovi in concert on his upcoming tour in the US. I logged on to Ticketmaster the moment tickets went on sale. The only tickets that were available were the nose-bleeds. I then searched some of the ticket broker web sites and they were asking almost three times face value for the tickets - making it cost prohibitive for the average Joe like myself. Why are these ticket brokers allowed to gauge consumers like this? And does anyone know where I can get reasonably priced Bon Jovi tickets (on the floor)?