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I would avoid them and all other programs except Google Adwords and Overture.
Knock yourself out on these 2nd/3rd tier programs. I'm just suggesting that your time could be spent more wisely on other more profitable efforts.
ref=findwhat 55 9 16.36%
ref=google&group=1 625 152 24.32%
ref=google&group=2 561 131 23.35%
ref=googlec&group=1 465 123 26.45%
ref=googlec&group=2 467 105 22.48%
ref=hotscripts 38 9 23.68%
ref=looksmart 77 1 1.30%
ref=overture 140 36 25.71%