Yamaha, Mackie, Allen & Heath, Soundcraft, and ART all make mixers with at least 6 channels on them in the $250 price range. So, there's more to the mixer landscape than Teenage Eng. and Behringer.
I can't comment on all the brands, but I've used Yamaha and Mackie for years, with virtually zero problems. My old Yamaha 12 channel (which would retail for $300 today) was an absolute tank. It did countless shows in dirty warehouses, clubs, fields, and never even had a road case! Which, I I'd qualify as pretty reliable.
> If you are trying to figure out why you'd pay for this you aren't their target market
I actually think that I am their target market. I've got many thousands of dollars worth of eurorack modular (which is the same niche), synthesizers (including Sequential), guitars, and studio equipment. I obsess over this stuff, and spend money on it.
But, I cannot figure out why I would spend $1200 on this 6 channel mixer. The Burr Brown ADC? I guess you could argue the size is the selling point. But, that seems more like a solution looking for a problem. And, frankly, if you intend to use a mixer in your performance, the size could do more harm than good.