Random website owners mailing you to ask if you want a purchase link? Usually it's the other way around.
Well, it's likely their traffic doesn't convert, why else would someone go through all that trouble. Feels like a weird way of monetization.
And the average amount of clicks is kinda hard to tell... It all depends on the amount of traffic that website gets and the link location (header or footer etc), if it has pop ups and stuff like that. A lot of factors come in to play.
In a lot of cases it isn't even about the clicks/traffic, but for linkbuilding.
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