I dunno that I can separate the sizzle from the steak. That is, the attributes of a particular project and the customer's views on them are all part of a continuum that makes it desirable. For myself, when I'm doing something commissioned, I do what meets the customer's requirements. If I exceed them, it's at my own volition. For my own personal stuff, the entire thing is of my own volition and so I do what I damn well please.
In one of my other professional venues, I work with musicians of all kinds of levels, and believe me - a great many have work-related toys that have nothing whatsoever to do with said toy's profitability and everything to do with what pleasure the tool/instrument/what-have-you gives the user in the course of his/her work.
The accomplished professional can do whatever it is the customer requires, and still keep the lights on.
O'Deen