I don't see this personally.

We have a community where anyone is free to post questions and answers and even offer answers on the basis of furthering their own knowledge (ie I would have said this . . . do you agree?).

If you had this then you would be placing a burden on those mentors to :
a) Not be human and make mistakes
b) Not come as often because of all the private messages and direct questions.

In addition, I feel that some people would be disinclined to offer their own responses as the original poster could easily ignore everyones answers apart from the mentors. Even waiting for the mentor to answer when a perfectly usable answer has already been provided.

Of course, this is just my opinion and so please take it with a pinch of your favourite condiment ;).

SP