Honestly, hacking is fun. Have you ever just cheated a game so you were incredibly OP and could do anything you want? Think of it as messing around in Creative. There's no worry of dying, or limited resources, you can do anything you want, much easier than Survival. I've hacked on a different server once, just to mess around, and it was really fun. No one could stop me, I could fly anywhere, and beat everyone easily. However, at the end of the day, playing legitimately is much more fun, especially if you get banned.