Yes, I do. Here's why:
1) Chicks love it. If it's all smooth, they can get down to business without worrying about getting hairs in their teeth. And if you want her to shave, you can just say "Come on baby, I did it for you."
2) It makes your dick look bigger. This goes back to the first point: Chicks love it.
3) It's easier to clean up after masturbating, especially if you use lube.
4) It's easier to wash and keep clean. The cleaner your cock, the more likely you are to get a blowjob. Say it with me again: Chicks love it.