Interest checks are dumb and shouldn't be allowed. I don't think sellers should be allowed to bump at all for adding items. Of course there are times when this won't be to the best advantage to sellers or even to potential buyers. But in the interest of both fairness and simplicity (and in creating an understandable system that can be reasonably monitored without the need for an army of moderators) it should just be understood: once you start a FS thread, the seller cannot bump for any reason except to announce a legitimate price drop. Period. Period! If it's just clear like this, sellers can and will organize their selling strategies accordingly. And although it's not perfect (no solution is) they can at least do so knowing they won't get knocked down the because of bogus bumps.