I can tell you that there have been a couple sitting in my local AD for a very long time indeed. But it does mean I get to play with them.
But you'd have to be a very particular kind of rich dude to buy one, I think. Either very impulsive and whimsical, or just a long way down your list of desirables.
My amateur opinion on indies is quite positive, though. Firstly, of course not all indies are small - Rolex, the king of watch brands. Breitling another with big brand presence. But even with smaller ones, I think it's just a matter of balancing your risk - whether depreciation or long-term support - against the price bracket and the enjoyment you'll get from it. I love my Stowa, with an ETA movement that will be supported forever, and a price that makes it easy to digest either way. Troika's Sinn above, is the next step up and I think the same applies. Nomos a bit more expensive, and technically in house, but they don't make particularly complicated watches and cost less than a Tag.
So what the heck? If you can afford a watch, want to keep it and wear it, and are attracted to a particular maker, then buy it. I can see the residual value issue if you're the kind of person who buys and sells expensive watches. But if you're just collecting a few that you like, I think the fear of depreciation or servicing for your grandchildren is low on the list of priorities: as long as it's not a watch for which you're having to break the bank.
Nice! That GMT is something else, 'no???