If you offer rakeback then I would not do it. if you do not offer rakeback but want to be able to have your members/guests the option of rakeback then it's ok.
Otherwise you may loose the entire sign up if they were looking for rakeback and just left your site for another.
But like I said, if you offer your own rakeback then yes you will be loosing in the end offering other's rakeback. unless of course you just can't compete with them.
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