"We don't support Linux, use windows"
Because Linux users are a pain in the ass.
You can find a bugzilla from about five years back where I had a problem with the built-in NIC on an ASUS mobo corrupting memory. Several others had the same problem on the same series of boards, and we were exchanging notes and working together on the bugzilla. Initially ASUS was helpful and looped in Atheros. But once we had a clear pattern (I mean a pattern of bit inversions in the hex dump), both went radio-silent.
I mean, what were they going to do, recall all the motherboards in that line just because they were no good? My time was worth more than the $90 for the mobo but we figured initially that its was a Linux driver bug and were trying to get to the bottom of it.
Anyway, had to rip it out and replace it (no slots left for another NIC in that application). Went to MSI ("oooh, jap caps") but those toasted (literally, burn marks on the mobo) quickly, found ASRock and haven't looked back.
I have an ASRock Z97 Extreme 4 in my cart at Amazon. Now don't you guys go buying them all before I put in the order on Friday. ;)