Role-play calls with another recruiter

I recently had an email from someone within my network asking for help setting up some regular "coaching" time with another recruiter.
 
He is a sole practitioner recruiter and is looking for someone (outside of his sector) with whom he can role-play recruiter situations.  The idea is to help both parties to sharpen up their client/candidate telephone skills. 
 
All he is suggesting is a half hour conversation once a week, via the phone (or face to face if location would allow).
 
In order for it to be mutually beneficial he'll need to hook up with someone of a similar level of experience.
 

Now, so far he's not managed to start this with anyone, and there doesn’t seem to be much interest in doing it.    What I don't understand is why not?   

I think that most recruiters will admit that they still have areas in which they could improve.  Sharing ideas with someone outside of your niche couldn't harm your business could it?

So, if you are interested please drop me a note or leave a comment.  If you aren't interested I'd love to know the reason why!