As a business case, this type of niche software is not so good. It's high complexity in development (requires lot of time to do), and even if you sell well the volumes is not going to be huge. That I make the GUI a commercial product is not really to make it a bread-winner for my company, but to allow me to put in a few extra daytime hours and not just spare time. I like to work, but I no longer have the capacity I had when I was 25.
I think BasICColor has about the only niche that makes sense commercially -- professional reproduction photography. For a pro photographer €500 for an efficient workflow tool is not unreasonable (just think about the cost of all hardware you need, and salaries), and for reproduction you really need it. It's low volume market, so the high price is necessary, and software engineering in Germany is not cheap. I don't think it's particularly good at making general-purpose profiles though, which instead is the focus of my product.
There's a reason Adobe doesn't care to sell their profile editor, that X-Rite's profile maker is not actively developed, and that QPCard, which is actually a Swedish company like my own, from the public numbers does not seem profitable enough to even finance one software developer. Camera profile making is not a great niche if you want to make a bunch of money. It is a great niche if you want an enjoyable software development challenge though :-)
Knowing it won't be a great financial success gives me some freedom though, I can make the software the way I like it personally and not put effort into making it sell as much as possible. In other words I won't make the software in a way that I personally don't like even if I think it's a good idea commercially. BasICColor has done the right thing(tm) in terms of design for selling as much as possible -- their software has almost no settings, and that's what the general user wants, something than looks clean and easy and something that just works. While my software will do great profiles with "one click" too, there will still be massive amount of settings and it will look quite technical and that will scare some people away regardless of how simple it will be to make a profile with default settings.