It's easy to be misled by that. Of course I mean intrinsic crummyness. Marketability is something else. Invention goes across the grain, against the flow. Invention does not accommodate, it threatens.
Invention is an asocial compulsion.
The inventor just can't stop it. So inventors either take a job and smile, or become managers and get sick, or stay poor. There are very few who manage to get it all together, and they may not be the best inventors.