Kate Linden demonstrates the effects of Region Object Bonus Factor (ROBF) on a homestead. She filled up a large parcel, and then gave us a bonus factor of 2. Even though we had more objects that we could rez on the parcels, the region was full. Kate took off some of her prims and we could rez more objects on the parcel.
Our next test was to see whose objects would disappear when you start to reduce the bonus factor. The test didn’t work out so well, as we didn’t have a definitive answer. It appeared that both newer and older prims disappeared.
With a few more tests, it appears that the newest objects disappear first.