He's only a manager. If he advises to take a deal, Colby can still say no, fuck you, keep negotiating. Also, what's too much? They pay him $45k to show right now. Is he asking for millions? I doubt it's a flat 100k, even. And NY is notorious to fighters for high taxes.
Anyways, now I understand why Dana shat on Nate recently. They're taking the Mas fight from him.
I hope this blows up in their face, though - Mas wins the title, then pushes for the Nate fight and loses the title to Nate. Diaz as Champ... Dana's worst nightmare.