This is a very interesting thread I don't want to drag off-track, but there might be someone in it who knows enough to get (separately) into the less sensational but also serious topic of PPC "arbitrage". As I understand it, this is the practise of discovering that someone will pay more per click than traffic currently costs from other sources and basically - without risk - marrying up that source and destination.
That may seem to be what buying traffic is supposed to be about, except that both traffic sources (which almost always require openness about where their traffic will be directed) and sponsors (who anticipate that traffic will actually have clicked directly to them) are being cheated by the black-hat operators. Fully legitimate affiliates are suffering too, because of the way this practise pushes up PPC prices.
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