well i did think about automating email notifications to warn users (but nothing ad-related though :). i'm not sure i wouldn't end up in the spam folder every time though!
I think a lot of users is and always will be clueless. Back in the days of dialup, with some ISPs it wasn't uncommon for those machines to be directly connected to the internet (rather than through a NATting router). It was AMAZING the stuff you could find by looking for (example) \users, or \documents.