Huge career implications on the line in this one for Machida, so he played it pretty safe. He was pretty much told he was getting a title shot if he won, so he made sure he won without taking a shot at getting finished. He clearly won and he's going to be a very tough out for Weidman.
To clarify further.....winning two belts in the UFC puts you in limited company. So, while he stands to make a lot of money in a title fight, the opportunity to become a two weight class champ is huge. Rarefied air.