The Klitschko's and there shocking contracts have left Haye with no option but to meet Valuev for the title and a better deal.

Interesting what Valuev had to say about the Klitschko's

Niko, news about your fight with Haye has left many shocked. How quickly did you make a decision to take this fight?
Negotiations were conducted very quickly. It didn’t take long for me to think about and agree to this fight. I am sure that I’m better than him.

You knew that Haye would pull out of the fight with Vitali Klitschko?
Yes, I knew about it, but Vitali has not followed through on his promises. Several months ago Vitali and I spoke by phone and agreed to have a fight between us. Then Vitali stopped speaking to me. I communicated this to my promoter and they informed me that Klitschko doesn’t wish to fight me. What should I do after that? Wait? But by the time of this fight I’ll have not fought for nearly a year. A strong contender is necessary for me. I have chosen Haye. Unlike Team Klitschko, we have quickly come to an agreement with him.

Now having selected Vitali’s planned opponent, do you think this could cost you a fight against the Klitschkos?
If the Klitschko brothers wish to claim all the titles, they should fight me.

Haye has stated that he refused the fight against Klitschko because of a bad contract. What conditions did Haye demand?
I don’t know. Ask my promoter. But I think it wasn’t the money. I know that Klitschko offered bad conditions for Haye. I even looked at the contract. These conditions were awful! The Klitschko brothers think only of their own benefit when make contracts for their opponents.

Source:Fightnews