grftI'm going to dissent with the majority opinion and say that it's NOT a dirty move. In fact, depending on how you do it, and how often you utilize it, it's an excellent GM tool that all you close-minded folks should be considering!
Can't say I agree with your examples. All of them can be achieved in other ways that doesn't mess with the point or purpose of the Destiny pool.
Any old dog that's run Fate, Savage Worlds, or Warhammer knows that you gotta get out there once in the beginning, wreck the point pool, and have your players flip the table over on top of you before the point economy really makes sense Let him take his licks. It'll build character