I don't care overly. It would be inconvenient, but I could live with the world knowing I hired.
I've always believed that if you're an enemy of the gay community, you don't deserve our protection. I believe that we're in this together, and we don't out each other to protect each other from bigots.
But we don't 'owe' it to each other keep silent as some unbreakable oath. If you're really paranoid about being outed, then you should ensure no one knows your secret. Don't go to gay bars or the like, then act against us from the pulpit or the legislature the next day and expect our complicity. If we're not personal friends, and I know you're gay, then it isn't a secret.
Which brings me to escorts. There is a greater assumption of discretion/secrecy from an escort. But everything has its limits. If the person is a real enemy of the community, I think shielding them is the greater negative, though I wouldn't argue with an escort who chose to keep their secret - particularly since outing them probably terminates the escorts career.