[joewatch]

I think always limping in preflop is a reasonable game plan. Basically, what you are doing is depending on your postflop play to make $. This is especially good at low-limits because raising almost never serves one of its main purposes, which is to limit the field size. But if players see what you are doing, then it will be -EV since people will always fold when you get involved in the hand. And you will leak money like a sieve with all of the preflop raises that you call. However, at low limits, people are rarely that observant.

If you find your play is profitable without ever raising preflop, I say do it.