Yep. I never click on website profiles when I know that the person can see the visits. The good thing about LinkedIn is you can turn that off, but even then, I notice it adds the person to the suggested users list after a month or so (I wonder if it adds me to their suggested list?).

There's lots of reasons why I don't want people to know. Like for example, a friend works at company x, so every so often I look at other employee profiles at company x to see if he joined LinkedIn (and is therefore in their connections).

Just harmless stuff like that, which might look sinister to someone who doesn't know the context.