Stalling the action near the bubble is part of a solid tournament strategy. If for instance a min-cash is 27$, then I am not going to let someone sitting with almost no chips at a different table win that money at my expense, just because someone at my table is an action junkie.
Its important though to understand, when you gain something by stalling, and when you dont. As someone said already, you see people stalling, when the tournament is in hand for hand mode, and that of course makes no sense. You also see people stalling, when its obvious, they need more chips to cash or ladder up. For instance if there are 60 players left, and the next payjump is at 26. Then a short or even middling stack should try to chip up rather than outlast 34 other players by not playing.
On the other hand if its now down to 27 players, and there is no hand for hand, then it would be kind of dumb to go all-in without first using your entire chip bank. Say you min-raised AK with a 18BB stack and someone, who has you covered, has moved all in. Then you need to make the call, even you are not loving it. But if you wait as long as possible, maybe someone has busted at another table, and you end with a higher price, if you lose. So in this particular situation you should probably spend up your entire time bank before calling.