If blinds are high and there is a lot of dead money preflop, then picking up the pot uncontested is an easy way to increase your stack with minimal risk. Any pot you win is good for you.
So, say you're on the button, the blinds are 100/200 with 20 Antes, and there are 5 limpers ahead of you. Theres already 1480 in the pot and no one has shown any real strength. From position, you can easily make a nice-sized raise to try and win the pot.