Fair enough! It just seems that they missed a trick by not having that extra capacity for range, or ability to operate into airfields that might not have the requisite fuelling facilities. Perhaps a VIP 787 was just like someone having a Chelsea Tractor to drive around a big city or a 200mph car with the speed limit of 70mph.
Interestingly there are only a few flying and they've changed hands a few times in the last handful of years, so perhaps the operating costs were too high even for very high net worth individuals, or attracted too much attention.