I usually play pass and come. My plan (that I don't always stick to) is to bet up to two come bets up with full odds. Sometime if there is a seven on the come out after I have come bets up I'll pay to keep the come bets working. I never thought to ask, from an odds perspective how bad is this? I guess you lose the + on the 7/11 on the come, but how much of penalty is it? On a hot table I like keeping those come bets up (with their odds).