At one point or another, we've all received invites in the mail for "totally free" weekend getaways or Disney tickets in exchange for listening to a brief timeshare discussion. However as soon as you're in the space, you rapidly understand you're trapped with a very gifted salesperson. You know how the pitch goes: Why pay to own a location you only go to once a year? Why not share the expense with others and agree on a time of year for each of you to utilize it? Prior to you know it, you're…