Kenny, the difference in cost of wood might amount to $20 if it was you or I building, for Ibanez, the amount they make, if it was more than $5 difference I'd be surprised.
I think it's all demand. I mean, lets face it, they will pay less for a 6 string trem, and 6 string pickups, because they use way more of them, they have CNC machines doing the grips and claws, as well as the inlays, there is maybe $50 more labor in a VWH. Bottom line is, they are very comparible guitars, the UV is cheaper because it doesn't sell as many, and because the VWH is Steve's main guitar, the DBK is no less a guitar than a VWH, but it's $500 cheaper in part because Steve doesn't use one as much.
Just like running shoes, the ones that Michael Jordan uses aren't any better than the non endorsed Nike's, but they're still $40 more money.