Everytime you limp, the poker gods kill a kitten to soothe their anger at such a stupid move. Save the kittens, stop limping.
Look at it this way: A rag s can get u in trouble, if you can get away, fine. But even getting in cheap in position, yr chances of flopping that flush are around 120:1. So 119 times you are basically paying for a hand you will throw away (unless you are chasing a draw), and either way, if 3 to a flush hit the board u r unlikely to get paid off for all the times you threw in yr chips (dozens of times -- you need a big payback to break even and it is unlikely).
Everytime you limp, the poker gods kill a kitten to soothe their anger at such a stupid move. Save the kittens, stop limping.