That's the thing that always stumps me when these kinds of questions come up. The answer isn't as simple as it looks. If I have this metaphysical power to travel through time, how does that change my sense of reality? And why would I waste that power just buying comic books? If it's some kind of Quantum Leap power, would I leap into my own seven year old body--and how would little Jimmy afford all those extra comic books I would want to get--would he have to become a thief? Or would I Quantum Leap into a stranger's body and hijack their life just to satisfy my own desires? I think I would end up living long enough to see myself become the villain, corrupted by having too much power.