I've done this just to catch something that I knew I was probably going to win, that closed the same day as my ship date. Put it off until the following week so it all goes together. I don't think they really care if you manage to get a shipment put off a week. Doing it multiple times in succession is excessive, and a good way to potentially get the loophole shut.

While I'm not sure if it's something we should discuss publicly, I have no doubt cbid is aware of this, and aware that people take advantage of it. If they wanted to shut it down, they could do so pretty easily. I can't pretend to speak for them, but I'd hope as long as it's not abused, they'll leave it the way it is.

ETA: Exactly what Ropey just said^^^^^