Not entirely related to the GruppeM product, but kind of to the discussion going on here (and certainly no slight at anyone's decision to get a GruppeM or any other product...) but working as an engineer, and having to deal with marketing/business people, and the outside world, I've found that it's perfectly valid and viable to have an entire business plan or strategy based upon crazy people.
Case(s) in point:
The Lamborghini is nothing more than a rebodied Murcielago - a decade old car - with some fancy graphics. They still managed to sell 20 of them at 1.1m Euros a pop.
Koenigsegg (or however you spell it) sell (IIRC) less than 20 vehicles a year - yet they're doing alright.
Bristol Cars manage to sell maybe one car a decade, yet still have got a prime location showroom in Kensington and stay alive.
Business plans based on selling at very low volumes at very high prices to crazy people work.
The Rolex analogy doesn't really work - Rolex are semi-mass market, trading on name and perceived quality. They're almost like the Porsche of watches - desirous, but common enough that they're not really rare. A more apt comparison might be to a watch manufacturer like Ulysse-Nardin, who's average watch price is 20,000 Euros or so - they're about as common as the Reventon (i.e., you'll see one or two in London or Geneva or Paris but very few elsewhere).