I don't really have an issue with low post count sellers either. If you don't want to deal with them, you don't have to. I've been known to hold items for people that I've either a) dealt with personally or b) have plenty of positive feedback from others here, but if someone doesn't fit in those categories, I most likely won't hold something for them more than a day or so.
On the other hand, I'm sure that many of the headaches that the mods have stemming from the want ads sections are from new members that are only here for another place to list their items and don't care to take the time to read, or follow, the rules that have been set up for posting there.