Suited connectors out of position

[tubasteve]

Think of the whole 4xbb vs 3xbb thing this way:

By putting in one more BB preflop the pot is 2bb bigger on the flop.

Now youre betting 2bb more with a PSB than you would have, so when he calls you are getting in 4 extra BBs than you would have.

Then on the turn, you pot again and get in 8 extra BBs.

By the river, you can 3/4 pot or full pot and get in around 12-16 more bb on average.

So by using 4x instead of 3x, when you flop a monster and get looked up you win much bigger pots on average.