How does this work?

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I've spent more time than I'd ever thought I would with the PTC sites. Paypal shows no receipts. How do people get paid for these things? Is there something I cn do to make sure of income? I certainly can't ask anyone to join in if I can't see any results. Are there tricks? I've also been curious about not using AOL. That makes me wonder if there's something unsavory about this form of moneymaking. Does anyone know of anything?