Delays are a tactic for a round or two, but every round the CTs sat around on the roof/bridge and made no attempts to penetrate the building.
Waiting till all the Ts get bored out of their skulls and pop out is un-realistic, and makes for bad game play for everyone else. If you want to camp, go T. there were a few rounds where there were only a few Ts left, but still the CTs camped.
I dont play that often, but when I do, I dont have the time to spend 90% of the time camping and waiting for 10% of the action to happen.