I always wondered why they built Aulani. Seems it only serves to increase DVC sales and doesn't provide much synergy with the Theme Parks.
Hawaii is viewed as a sort of "if you can't make it there, you can't make it anywhere" timeshare destination. (At least, it is when you consider most other timeshares don't have the rights to build on Disney property.)
Hawaii has great weather year-round. If you consider most other popular tourist destinations, that's usually not the case. Colorado ski resorts and many beach towns have their off season. Locations like NYC and DC present their own challenges, not the least of which is cost to build there.
Hawaii is a popular vacation destination which is relatively accessible to the entire US--particularly the west coast, of course.
Several years ago the head of DVC was quoted as saying 85% of its members lived east of the Mississippi. So I think DVC viewed that area as being a growth market...not just for the Japanese but among people living in the western US, too.
it adds great value to the program as a whole. There have been a lot of reports of members being disappointed with lack of availability at 7 months. DVC points at all resorts become an easier sell if they can claim "your points are not only good at the Disney parks but also Hilton Head, Vero Beach and Hawaii." Helps assuage the fears of potential buyers (or spouses) who are hesitant to commit to decades of stays at WDW or
Disneyland.
I've also heard stories that it was a sort of pet project of a certain high-ranking Disney executive who is fond of the islands.
The tsunami is often mentioned as having harmed Aulani sales. Hawaii publishes extensive tourism figures and despite the tsunami in March 2011, Japanese tourist arrivals and spending increased every year from 2010 to 2012.
Aulani is such a large resort (nearly 500 rooms) that it was always going to be a very long-term project. Bay Lake Tower is nearly half the size and it took over 3 years to sell out. Impossible to know what sort of estimates DVC attached to Aulani but to me, it always looked like a project that would take 8-10 years to sell.