Kind of. Timeshare sales are famous for their high-pressure sales tactics (see the famous South Park episode), so there would be an assumption that these people are susceptible to these tactics.
The issue is less that timeshares are outright scams (though some are), but it's that buyers are locked into a very long term contract that is difficult and expensive to get out off. What may have seemed like a great idea to take the kids on an annual beach vacation now becomes a PITA when those kids are teenagers and now don't want to go on trips with their parents.
So with timeshare owners you have (a) people likely susceptible to high pressure sales tactics who (b) are likely highly motivated to get out of their contract. So a perfect target for scammers.
The issue is less that timeshares are outright scams (though some are), but it's that buyers are locked into a very long term contract that is difficult and expensive to get out off. What may have seemed like a great idea to take the kids on an annual beach vacation now becomes a PITA when those kids are teenagers and now don't want to go on trips with their parents.
So with timeshare owners you have (a) people likely susceptible to high pressure sales tactics who (b) are likely highly motivated to get out of their contract. So a perfect target for scammers.