I know for people considering the purchase, money is key. But for us, while we figured we could probably stay more cheaply (hey, we have friends in Orlando. we can sleep on their couch for free!) we couldn't stay as well as we can with
DVC, factoring in the cost.
We also couldn't treat friends and family without DVC, which we love to do (when we walked into a 2-bedroom at OKW with our pals -- it's the closest I'll ever come to feeling like a superhero! they were so thrilled), and the temptation would be, whenever money is tight, to stay at All Stars or Motel 6 or whatever. Now we never have to do that, even tho we are down to one income. My husband, who was the one who took convincing, tells me everytime we walk into DVC how smart he thinks we were for taking the plunge. (We bought back with DVC was really a deal...we'd break even or make money off it now.)
Our purchase price is paid off now, so we just have dues. We normally only spend one weekend night, so our 206 points go far.
Anyway, my overall point is that it's about more than money. It's an emotional, bang for your buck kind of thing.