[flir]

That's not my experience. But if it does happen, does it matter? All that happens is that less work goes into the next sprint, right?

(I'm suggesting that the problem in your process might lie elsewhere - with mapping points to time, maybe, because the points system should be self-correcting to that kind of gaming).

[laserlight]

Totally agreed. But such understanding is not the approach of power-game players in the first place. For such people, agile is a tool of oppression.