I'm a bit of a research junky so I looked into DVC for YEARS. I am also a Disney junky so I really really wanted the numbers to work but I couldn't get the return to come quickly enough (although, I will admit that I didn't take into consideration the discount on annual passes etc. so my calculation wasn't 100%). I just couldn't justify spending the money. We took a tour and it would have been about 20k just to get us started.
A few years went by and I came across an email with resale listings and I was shocked. We bought almost immediately. We bought more points than we were considering directly through Disney and we paid about 40% less. Plus we got a loaded contract. So we are really really enjoying or first year or two with all of these points.
The inability to book a cruise isn't a concern for us. When I did the math we would have never been able to do it anyway. Too many points. I do wish we could book at some of their other opt-out resorts, but I've read over and over again that it doesn't make financial sense. We can utilize RCI and the other one. Although, with Vero, Hawaii and Hilton Head we really do have some great options not at WDW.
Unless you have money to burn I say go resale. We did and we are thrilled. Good luck! You will love it!