[ATauO1]

I agree with the other posts- its done for many reasons-
It can also be done to set up bluffs- your going to bet no matter what hits the flop because you know everyone else is going to miss the flop roughly 70% of the time this is really true if you raise and cut the field down- if you hit nobody is going to know- if you don't hit, take a stab. if they fold you won- if they raise you fold< and show your hand and say "i was just kidding" they will think your a maniac and call you when you have a big hand.....

For the bluff to work make sure you know who you bluff and that you have a good image- don't bluff the calling station that NEVER folds-