For the cameras and audience. Pete knows how to jerk his cock off just right for the bigger squirts. So in essence Pete was sacrificing a more pleasurable orgasm for the delight of his audience. What a great guy.
Bunny always worked and milked Pete's cock the best out of all the other skanks. He said that in an interview that she always was his favorite to work with. Look how much she makes him moan and how big she makes him squirt.