Also, piggybacking on Dino's point, I feel like you have to distinguish watches from other consumer goods.
Let me make a quick example. Lets say you commission a suit from Rubinacci. Or a pair of shoes from Delos. There is a finite life to that product, whether it be 10 years, 20 years, or maybe a bit more. The suit may need alterations, or the shoes may need to be resoled. Yes, you could ship them back to the manufacturer. But a good cobbler should have no issue taking care of you. Or a good tailor should have no problem making the appropriate alterations. The risk that is accompanied by the "romanticism" of purchasing from a small operation is not very large in these circumstances.
Now, lets switch over to watches. A watch will tick for a while, but it requires maintenance. It requires maintenance every 5 years or so, at the most (well, that can be a debate for another day). It will need spare parts as well. A watch will also last for I don't even know how long if it is well-cared for. With the current materials that are being used, I really do not know how long watches made now will last, but I am sure they will hold up better than what was produced in the 20s and 30s. A watch is something you will likely pass onto your children one day. With all that in mind, part of what you are paying for when you buy from a larger brand is the assurance that all of these parts will be available down the road. Namely with Patek, they effectively warrant that they will be able to fix your watch, for the right price. The Habrings that you are looking at WILL need parts. And although most of them are not finished by hand, they do make modifications on the movements. Modifications that likely will not be available if Habring ever goes defunct.
This is more of a buyer beware type of thing. I want to venture into Indy land one day. But it will be at that point in time when I have already accumulated what I want from less risky sources.
I understand the desire to buy from a small outfitter, I am just trying to illustrate that watches are a different type of product that guitars, shoes, suits, et alii.
And personally, I like Habrings, and I think that the doppelchrono especially is an incredibly cool piece.