Hmm, I think its rare. First, the check-6 call has a habit of sticking to the wrong guy. Second, some people hit it accidentally, 50% of the time they apologise. Third I have had it called when I've been right up a guys 6, the guy calling it was d3-4 away, obviously the close proximity looked like the bandit was on me (ie there was no way the caller was trying to get me out of the way).
I think its the exception - not the rule, besides, some of these newbies who try this will get a nasty suprise if they pull someone off somelike hb, drex, kb, ziggy, and so on. Doesn't take long for an experienced pile-it to turn the tables - and there are plenty in the MA.
My suggestion is if they do pull you off, leave em to be slaughtered.