I could not have said it better myself. My motivation is actually the opposite of yours. I prefer not to stay in one place for more than 6 months or so. Of course I've stayed longer but I do like to move often.

EDIT: To clarify a bit more. It really has to do with how much a value being able to move whenever I want. If I have a job that requires me to be in the same place everyday, I feel constricted. This often leads to resentment and poor performance.