" and of them how many are going to waste good drinking time trying to crack a key"
Reality bites. There are always "script kiddies" congregating ANY WHERE that there is public WiFi access, they aren't old enough to drink in many cases and when they are--they're not drinking while they are working. All they need to do is RUN A SCRIPT, no mental exercise needed, aqnd they will gain access to your packet stream and perhaps your computer as well.
These guys are across the street from every macD's and Starbucks and they spend days in airport
lounges, just to see what they can see. They're like fleas: Not all dogs
have them, but if you see a wandering dog, you need to do a flea check.
Could easily be an employee at the bar, too. A lot of minimum wage help have sold credit card numbers and gotten involved in other petty theft, it helps their minimum wage.
The point being, bad guys are out there, and they come to sniff around public WiFi points. If I were a bar owner and someone set me up with WEP--knowing it couldn't keep out anyone except granny--I'd be worried. Here in the litigious US, some boater comes in, "pays" for the 'secure' WEP access, finds out his online banking session got cracked, and now he sues the bar owner (who promised security) and the bar owner turns around and sues you--because you told him it was secure. Even worse, for the same price
and effort you COULD have installed real security
Uhuh, bad day for everyone except the lawyers. And the lucky hacker.
Sorry, but I know folks who have spent hundreds of hours over many years trying to repair identity theft. It is real, and the price is way higher than you'd want to pay.