Because I can. I have a hardtail, a rigid, and a full suspension. Guess which one I ride pretty much all the time. Not only is it a full suspension it has 140mm of travel and I'm riding all the same crap on it I can ride with my rigid. The great thing these days is there really isn't any downside to a good full suspension frame and having that extra travel other than $$$$ and even there I scored an insane deal. My 140mm FS doesn't pedal bob and climbs 95%+ as well as any short travel HT and my rigid I've had.