I'd fully support making professional-quality UTAU with optional donations for the banks or maybe paying for a commercial license, or something like that. But the bank better be stunning--CV and VCV and maybe CV VC, excellent recording technique, almost no background noise, multiple tones, HQ microphone, excellent oto, possibly bilingual or more.
But given the sheer number of free UTAU out there, yeah. I wouldn't pay for anything sub-par. But the Macnes and Win100% UTAU sell fine, which is understandable, as they have those things! So, yep, pretty much what the rest of the thread said.
tldr? IF YOU'RE GONNA SELL AN UTAU, MAKE DAMN SURE YOU KNOW WHAT YOU'RE DOING.