At one point or another, we've all gotten invites in the mail for "complimentary" weekend vacations or Disney tickets in exchange for listening to a brief timeshare presentation. Once you remain in the space, you rapidly understand you're trapped with an incredibly skilled sales representative. You know how the pitch goes: Why pay to own a place you just go to once a year? Why not share the cost with others and settle on a season for each of you to use it? Prior to you understand it, you're…