I know one guy who sells a zip utility who swears by them. That said, I'm with you: it strikes me as highly likely that the increase in my blood pressure will cost me a lot more than the marginal revenue gained. In addition to having confused customers to worry about, I simply do not want moral association with many of things sold via CPA offers, even on TrialPay (which is, by all accounts, an upright and honest company in a pond of scum).