Earlier quoted context omitted.
What the scam? "Free flight" if you buy the timeshare or something?
Roping the unsuspecting into an incredibly expensive time-share using hard-sell boiler-room tactics without ever being up-front about the true costs. I sat through one of these once, curious about how it was going to go, and with the intent going in of not ever buying anything anyway. They present the timeshare as if it costs only pennies a day, and never admit to the true cost unless pressed very hard (and even then…
The other option is go on vacation, send your parents to the presentation, and you take the freebies. This worked for a friend of mine- his parents old/disabled enough that they couldn't enjoy scuba diving and the like anyway, they were mentally competent enough to not sign anything, and they enjoyed the presentation better than the other tourist traps in the area.