At one point or another, we have actually all gotten invitations in the mail for "complimentary" weekend trips or Disney tickets in exchange for listening to a brief timeshare discussion. But when you remain in the space, you rapidly realize you're caught with an exceptionally talented salesperson. You know how the pitch goes: Why pay to own a place you only go to when a year? Why not share the expense with others and concur on a season for each of you to use it? Prior to you know it, you're…