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Giving the option of "Purchase from your site and get a commission" and "Purchase from a competitor", most would opt with the former I believe.
Certainly from a merchant perspective I would actively promote self purchases from my affiliates, if you have 5000 odd affiliates at Christmas then that can be an awful lot of sales from a very loyal customer base!
The Affiliate Commission Exchange will match your Purchase intention with someone elses affiliate link, and in return match someone elses purchase intention with one of your referral links. So everyone helps each other out and you get rebates (earn commission) whenever you purchase online.
If you purchase online and have affiliate links yourself, you would be crazy not to use an affiliate commission exchange.
what i am saying is the role of a publisher and a customer is totally different and they should be separate all of time.
A even better question to ask is: "you mean i can't buy stuff or service from your company for being an affiliate?" Or
"you disqualify me as a customer for being a publisher of your company?" lolz :)