Here are the stats of one of my tiny free sites showing Panda 2.2 coming in, the site is a couple of months old and has had almost zero promotion and just a small number of updates. If I had 1000 of these it would be a lot more interesting! I can see how the mini sites can pay off if you get them right and create them in bulk. On it's own this one isn't much more than an experiment + $500 revenue per year