[Proofrock]

Of course with any rule there are exceptions, but as a standard playing a more-or-less raise/fold game is very well-suited to the mid/late stages of a tournament, for the following reasons:

(1) Shallow stacks (i.e., <30+BB) drastically decrease your implied odds, so there are few situations where your hand will actually merit a cold-call.

(2) The Gap Concept makes reraising or folding much more appealing in most cases than cold-calling.

The exceptions to the rule show up only when stacks are relatively deep or when you have a very good handle on your opponent. For example, if you know your opponent is a nit who will only CB if he has TPTK or better and will check/fold everything else, then calling preflop in position is a great way to build your stack with little risk.