Originally Posted by mineistaken

Still my point stands the same. Just cahnge my example to: why would he earn 1000$ by selling you traffic that will earn you 1000$ if he can send that "1000$ earning" traffic to his sites and earn the same 1000$.

Of course again not to mention that you and him might earn different revenue from that traffic.

Only reason maybe that he thinks you would convert that traffic better. Otherwise - makes no sense.