I've heard if Pro Golfers weren't aloud to accept endorsement contracts they'd all play Mizuno Blades. Agree?

Most PGA Tour Golfers are paid to play the clubs they're using. It's not because the want to or even like those clubs the best. Money talks! I've always heard that if the PGA Tour outlawed club endorsement contracts then nearly ever Pro would play a forged Mizuno blade. I'm interested if you've heard the same thing?