No organization is willing to pay companies to support Linux
Well that's a lie. Lots of companies use Linux servers, Linux embedded devices, even Linux desktops for programmers or engineers. Android devices are everywhere too.
That's because organizations like the Linux foundation primarily serve enterprise and server customers, they only need a good enough UI so that's what desktop users get. Nobody is paying money for Linux and few people donate.
One of the most common uses of Linux is smartphones. Chromebooks are also fairly popular. It's more that the kind of people that use Linux desktops aren't happy with smartphone like functionality and customisation.
The better question is why aren't people supporting desktop Linux? We have increasing market share after all. My guess is a combination of fragmentation and the fact that the user base aren't the kind of people they want to sell too. It's hard to sell MS Office for Linux to your average Linux enthusiast who might even be an Open Source purist. They are also more likely to jailbreak or pirate your product.