Similar to Witzend, we knowingly attended a UK 'presentation' which was, of course, a time-share sales pitch.
We accepted the holiday (good-quality accommodation, flights included) and jogged along to 'find out about the beautiful resorts'. After several hours, we were still quite happy but... we were asked to leave. Why? The chap presenting (i.e. selling like mad) was a smoker, he needed a ciggie and as he told us, his next 'client' was due in ten minutes. Us 1. Time-share company 0!
We had known exactly what would happen and knew our strategy (could afford it but didn't want their product) and ourselves to be strong enough to resist the silly sales tricks, i.e. ringing a bell (really!) when someone signed up.