Not worth the effort TBH. I messed around with most of them a while ago but found that the amount of traffic wasn't enough to deal with them seriously.
Not to mention there is a high percentage of fake/crappy traffic from some of them.
It's best to spend the time maximizing your Google/Yahoo paid clicks... and if you do mainstream Microsoft's Adcenter as well.
That will take a nice amount of time in itself.
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I've trusted my sites to them for over a decade...
Webair, bitches.
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