We viewed the $15,000 as a vacation fund to be used annually. Investing in mutual funds that might return 10% is not practical for an investment you intend to use every year. So, assuming you put the vacation fund in a safe vehicle where you make 2-3% or even 5%, the vacation fund quickly sinks and you wind up with nothing left in about 7 years. Now, after 7 years, we firmly believe we will be able to sell the points for at least (probably more than) as much as we paid for them. The best part, however, is that we can afford to take more vacations now! On a whim, we decided we were ready to go back the first week of March during DD's spring break. The APs are still good from last May (saved over $300 with DVC discount), the room is free, so why not? Food, gas and souveniers should be less than $750. Can't take a spring break trip anywhere these days, much less a WDW-BWV vacation, for that amount of money.
We may get sick of it but I figure we can at least break even on years we don't go by renting the points. On our summer trip this year, we are taking my sister and her family with us who have never been due to cost.
Yes, Disney wins b/c we spend our vacation money there every year. Guess what? - Disney had already won that battle. Now at least it is somewhat of a win-win.