@Grit I think that what we bitch about isn't necessarily "player A needs more burn or else he will transfer" because Player A is so good or valuable. It's that Player A gains more value over time in the program relative to his replacement, who might also only be in the program for one year.
Coleman/John is a perfect example of this. Coleman is having a really nice season at A&M and John is having a really nice season at Duke. Next year, Coleman will be having another nice season at A&M, and Duke's roster is a hamster wheel.
Coleman is a better value long term, IMO because he likely has 3 and possibly 4 more years at A&M being a productive player.
Duke, on the other hand, is rolling the dice.