It does exist. Its really hard to quantify in all situations. I think if you are on a guy from go and someone jumps in really late (cycle or 2 before signings), at D1, the amount is 10-30%. But it only amplifies what you spent the first day. So its usually a small amount, even at D1, since if people put 30 home visits in cycle one (~$10k), that's an extra 3-9 HVs, which isn't that much ($1-3k).