Brainwashing, that's why DW agreed

Seriously, we bought on our honeymoon, which was
DCL 4-night followed by 3 nights at WDW.
We have friends with a Starwood timeshare, so we began researching it (ok, I did and kept feeding her info) while planning the wedding. I requested the
DVC propaganda along with the WDW DVD, and we watched them a couple times. We weren't sure about which timeshare, but were sold when our friends used their's to stay at a Sheraton in Portland for our wedding, gave us a wedding eve room at Four Points in Portland, and gave us the three nights at the Swan for our honeymoon.
On the cruise, the default channel was the DVC propaganda info, so that fed our brains for several days. When we got off the Wonder, we decided to check it out. We took the tour that day, talked about it during our stay, and signed before we left on the last day.
The key for us was how much we separately enjoyed Disney and visiting the parks. We knew we wanted to make this our regular vacation destination, so the buy-in was easy. Of course during the planning, I ran a couple spreadsheets to determine the cost of purchase and financing.
We decided to finance our purchase, and we have no regrets. Even though we essentially paid a higher price per point due to that, financing enabled us to start earlier, which we felt was worth the extra cost.
Good luck and enjoy!
- Chris