I agree. If a client is asking me and I sense that he hasn't read my profile then I prefer not to go any further.
The problem is for me, is that they've read my profile but don't believe it.
"Is it you in the photos?"
"Your profile says you're English, are you?"
"Do you have any STDs?"
As I've pointed out to countless enquirers, if I was unethical enough to lie on my profile, use someone else's photos, or work with an STD, would I really tell you the truth just because you've asked me?
If my over 100 positive feedback doesn't reassure you then nothing will.