OK, I gotta ask. What do you define as "productive"? Traffic that buys? Traffic that clicks?
If you need high volume feeder traffic, see
http://www.fpctraffic2.com/buy.html
If you're looking for niche clicked traffic, see
http://www.fpcclicks.com/
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AdultAdBroker - Buy and Sell Your Flat Rate Banners, Links, Tabs, Pops, Email Clicks and Members' Area Traffic - updated January 2026