Yes, right after the change (back in the day, you could view anyone without them getting notified, or being able to see who'd been checking them out), a small cottage industry of "snoopers" popped up. They charged something like $1 - $3.5 pr. query. But that seemed to have died out a bit now.

I think most people simply don't care enough to check out other people, while risking to come off as a snooper.