Add to the "chance of moving" cost: your opportunity cost in lost income (or additional expenses) by being unable to sell your house in the course of a move. Either you lose out on the income opportunity (which is what this subthread started with), or you're left with the higher costs of renting out your home (likely not covering mortgage) while renting at the new location.

We saw this last situation for a new hire who last year was unable to sell his underwater midwest home while finding rents in a markedly hotter housing market much higher, especially when proximity to good schools and low crime rates were factored in.