Are you referring to the photos they take of you when you enter the parks? Or just photos of you with your own camera? Like the other poster said, when asked almost everyone is more than happy to take photos, including CMs. I know I'm always happy to do so for someone else. Most times the pictures turn out fine.
As for the professional shots at the entrances to the parks, I've bought a few of them over the years that were really good, but unless they're a great shot of me and whomever I'm with, I pass, they're expensive for a mediocre picture.