Did you purchase anything from a PTC advertisement?

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Well. I am seeing many people discussing about getting paid by a PTC site. I'm just curious whether anyone would have purchased anything from that advertisement. (Joining another PTC do not count here. I'm talking about buying any product.) In my earlier days (2 years back), I used to advertise my affiliate products on PTC / PTR sites and made some sales. But, recently it's very much going down. Do you think PTC advertisements will yield results now?