Maybe you're right in some sense but you're discarding 99% of desktop hardware.
Not sure how voting dollars work if you're representing 0.0001% of the market.
And 87.3% of all statistics are made up on the spot.
It's hardly 99% of desktop hardware, and I can assure Windows does not control 99.9999% of the desktop market. And it's not always "server hardware". And since you mentioned SuperMicro, you can get a SuperMicro board for under $100 if you'd like. If you spend less than $100 total on your MB+CPU+PS then you're really asking for trouble.
Do most desktop users run Windows? I wouldn't even give you that, considering how many Macs I see. But even if they did... at the end of the day:
A) Windows-only hardware is going to be cheaper (due to deals made with the devel, aspects normally handled by hardware being pushed into software, and them being willing to compensate for shitty hardware by putting lots of work into software drivers for the largest market)
B) You buy hardware to match what software/OS you mean to run. You don't try to run intense Photoshop-work on 2GB RAM, likewise if you need special Linux-driver support or care about sensors, then you don't buy stuff where the motherboard-manufacturer has skimped-out and used chips for which there is only Windows drivers.
C) You're going to have to pay a bit more for B, but it's not as much more as your exaggerations suggest.
And you really need to stop blaming Linux developers for lack of driver support when in reality it's the hardware-manufacturers' fault for not releasing specs and data. You'll find that Good Mfrs who do so actually get Linux drivers. The only drivers that get made for the others are the ones where a dev gets lucky reverse-engineering. Even popular hardware won't get drivers if the mfr keeps the specs closed and proprietary.
Again, vote with your wallet if you want change. Otherwise there's no audience for your complaining and your continued action is just working against your desires, as the mfrs selling stuff are getting the impression that people will keep buying their Windows-only crap. I can assure you, they're only looking at their sales sheet and NOT Slashdot forums.