Because it would lock him into some weak deal. However, If Haye beats Wlad, and there is no "fight my brother clause," Haye will have enormous bargaining power, and will be able to negotiate a much better deal for himself in the subsequent Vitali fight.
Remeber when Holyfield gave up a substantial amount of money for the first Tyson fight, in order to avoid a rematch clause.
Then after he beat Tyson, Don King had to negotiate with Holyfield for a rematch, and holyfield had the much better bargaining posistion.
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