As an argument on the other side - so long as you're making enough to live comfortably enough, then there's no real need to abide the business logic though, even if you think it absolutely does maximize income in the longrun. If you spend years working on something and it turns out somehow nobody else likes it, well at least you have something that you're presumably satisfied with, and you often learn an immense amount in process.

Careers that aren't quite so commercialized regularly carry out this process. The obvious example being writers where you may spend months/years writing a book only to find out that nobody wants to publish it. Or perhaps you ultimately just don't like it. I know Andy Weir (of "The Martian" fame) wrote about 75,000 words on his next novel before deciding he just didn't like it, and scrapped the entire thing.