Well lets look at the contract he has signed that signs his next 2 fights away to the Klitschkos.

People tried to say it was Haye that was stalling and difficult in negotiations - when it would seem that it was the Klitschkos and there contract that slowed the whole thing down.
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Haye contracted for potential Klitschko trilogy

If David Haye is successful in his heavyweight title challenge to Wladimir Klitschko the Londoner is likely to engage in a trilogy of fights involving both Wladimir AND his brother, Vitali.

The Klitschko brothers' German manager Bernd Boente revealed details of the contract yesterday to ESPN.com's boxing writer, Dan Rafael.

Points of interest include:

- Haye's only income for the fight (said to be ‘millions') will come from Setanta Sports' broadcast rights fee

- Klitschko will receive an agreed portion of the Setanta cash plus all the other revenue the fight generates including fees from HBO (carrying the contest live in the US), RTL (German broadcaster), any other foreign broadcasting fees, all the live gate receipts and income from sponsorship

- If Haye wins, Klitschko's promotional company, K2, will promote his next two fights

- Again, should Haye win, his next two fights will be against one of the Klitschko brothers – either a rematch with Wladimir or a match with Vitali – and should he win that one, he'll face the other brother

It looks like Haye has pulled out all the stops and very much taken the short end, including options, in order to make sure the June 20th fight happens.

http://www.britishboxing.net/news_4480-Haye-contracted-for-potential-Klitschko-trilogy.html