Camping... on the preview grid?

I was on the Aditi grid just now which was uncharacteristically hopping due to the main grid's update-downness at that point. I went to Grignano, which was afflicted with teh uber lag, and couldn't believe it when I saw massed green dots in the northwest corner, i.e. where there are camping chairs. I went over and asked - "I'm curious - why would anyone camp on the preview grid? They continued to talk to each other (the non-zombie ones) and ignored me completely. Why WOULD anyone camp on the preview grid?

For non-SLers, camping chairs and dance pads are objects upon which an avatar can idle for hours or days, provided by casino owners and the like, which pay out a tiny amount of lindens. In return, all those zombified people suck up the sim resources so actual living people who have things to do have no resources with which to function, and therefore have to leave the sim (or have already been denied entrance). This is VERY BAD when the sim is where your home or shop is. On the preview grid (the purpose of which is testing the new code) nothings transfers to the main grid. The state of the grid is ephemeral, so even if you "earn" 63 linden by camping your money doesn't transfer, your purchases (should you make any) last only until the grid changes and a new snapshot is employed, and besides that, LL gives everyone on the preview grid 5000L so they can buy things necessary for whatever test they are doing (testing, say, vehicles - you can buy a vehicle). Are these people just doing what they are accustomed to doing? What the hell is wrong with them?