Voted no.

Theres already a tool people use to count profile views which is viewable in your profile page

I would prefer a view counter than a "who's viewing" .. simply because how many people sit looking at profiles all day ?

Could be more of a list of the top 5 people who have last viewed your profile than something like the viewer bar at the bottom of threads
Of course it serves no real purpose, a lot of other forums have this and they too serve no real purpose, it's just for fun
Same as being able to see who views your thread, whether or not you can see who views them really isn't that important