This is obviously an extravagance, and it's being sold as such. However, on my last trip in November, I saw more VIP tour groups than I had in all of my previous seven trips combined. And in addition to the "official" WDW groups, there were plenty of other private guides (another topic for another time). So it seems to me that there is clearly a market for this type of service.
My question is this - with access to two VIP guides, would that allow your party to split up? For example, could one guide take people on KS while the other took folks to FoP? And if so, could you split parks or other locations?
It seems to me the main driver of this is SW:GE. And $2000 per person for a whole day's worth of unlimited front-of-line access to that area, while extravagant, is appealing if you have the scratch to do it. But if you have some of your party that has no interest in Star Wars, and they could take one of the guides to go do other things, that makes this even more appealing.
And if you can't split up, why have access to two guides for a maximum of six people?