We had a poll up somewhere not too long ago about what people thought about the profile viewing ability. If I am remembering correctly, people overwhelmingly liked to be able to see who had visited their profile.
I rarely look at my own profile unless I am seeing who left a visitor message but I can see where I might be more inclined to pay attention to it if someone I used to date suddenly showed up here and posting after me. (especially if it was that ONE ex. *snort*)
I like the feature myself. It's like a calling card of sorts and I kinda dig it when random people come by and leave a message for me or view my stuff. Cause then I feel all important and shit!