Not sure why you'd want that to be honest. You're bored and go browsing various profiles and then get inundated with messages saying 'Hey! Noticed you looked at my profile would you like to shoot? My rates are...'.
I can't imagine it matters much really? If you're scouting for a photographer, or a model, then you go find one, look at their work, maybe check work they've done with others.......thats the point of the site.
if you decide to message, leave a compliment, book, ask a question of someone, well, you just do. if you've no interest in working with them or any dialogue, then you don't.
What would be the point of providing some measure of how many other members viewed your (member viewable) profile, then decided not to interact in any way?
I regularly browse and search to see who's about, check out what other photographers are shooting, see how models contribute to good pictures, but if I happen across a port that makes me shudder, i move on sharpish, what point in letting someone know 'profilepictures felt unable to say anything nice, so he didn't say anything' in some cyber (un)popularity contest?
Theres enough of that stuff goes on in threads already i think, variants of 'who thinks who is great?' etc, for us to add to if we want, without 'who's of little or no interest' data.
Just to add a bit of controversy, it seems so lacking recently...why is anyone embarrassed at the suggestion a tog or model might think along the lines of 'woah! She/he is a brilliant model/photographer, I'd like to shoot with him/her' Its hardly stalking is it, and not really an unnatural reaction from a human or aesthetic point of view, what's with all the coy malarkey?