I have come to the conclusion that if you want to make maximum revenue with Adsense then you really don't want returning visitors each day i.e building a community. Google will reduce your money if you get simila people clicking ads every other day. It is short but I just wanted to share my thoughts with you and maybe it will make you think.
I have put so much work into promoting my sites and building up a nice community only to be penalised by Google. I would much rather put all my time and work into a few sites and really build something rather than having to resort in lots of little sites to make money.
Very true, that's why uniques are better! You can always try moving ads around... so they don't always look familiar.
Quite true, forums and communities tend to convert less and get payed less for the clicks they generate.