That's not funding. That's boredom or perhaps ideology. Most FOSS developers don't bother thinking about UX or even implementing a UI because it's boring. They're interested in the high-tech stuff that their software can do and hope somebody else will put a front end on it. But usually nobody does - at least not an open source front end - because all other FOSS developers are also more interested in the specific technical thing their software does.

I make money developing a front end for a popular but absolutely unusable piece of FOSS software. Other companies do too. It sometimes feels a bit wrong that the open source guys have done the biggest and hardest job for free, while I profit just slapping some windows and dialog boxes over the top of it. But they really don't want to do that part of it and have openly said they think their UI is fine and that people would benefit from learning to use a command driven interface.