Nope, because I am completely capable of making up my own mind instead of relying on someone to do it for me. I have a mind of my own, thank you. I am not a sheep!
Seriously though, no way. I see Yahtzee's reviews as being comedy and not actual reviews, personally. I don't listen to reviews anyway, I make up my own mind and screw what everyone else thinks, if they don't like it then fine but I refuse to let anybody tell me what to watch or play or listen to or whatever. So no, I haven't bought a game because of Yahtzee. And I won't in the future, either.