I've thought about this a lot too, and it is tied into the same line of thinking.
Put yourself for a moment in the position of that vacationer who liked what they heard about bottling that magical vacation feeling "at today's prices," or what have you. If you've been to a presentation (or even heard from someone else who has) you know that the math behind the sales pitch is at best dubious. For example, they typically use straight-line depreciation to account for the annual cost of the purchase price. However, anyone who paid attention in high school economics knows about the time-value of money; if they remember that lesson, they should immediately balk.
My brother is a good example. He and his partner were consultants for many years, and concentrated their hotel spend at Hilton. Along the way, HGVC talked them into one of their marketing trips, and the agent did exactly this. Now, my brother is a smart guy with an MBA from a school very comfortably in the top 20. He knows his way around a financial disclosure, and he called the agent on this maneuver. Later in the presentation, the agent did it again. At that point, my brother stood up, and said: "It's clear that either you're stupid, or you think I am. Either way, this discussion is over." He walked out.
But, lots of people still buy. Is that because they never learned high school economics? Probably not, because they also have mortgages, loans, investments in stock market indexes, etc. all of which are critically dependent on the time value of money. Instead, I think it is because in this case, they do not want to think about it. They are making an aspirational purchase to improve their family's lives and make vacation a priority. The (bogus!) financial argument is just a fig leaf that let's them tell themselves that they are saving money, and not spending money.
When that person gets home, they do not go looking for reasons why the financial argument was wrong because again they don't want it to be. So, they never find TUG until years later, if at all. Heck, we even see people who come here to ask if they should rescind, being told unequivocally "Yes!" and then arguing about it; that in their case, really it was a good idea, wasn't it?