I've read a few comments here in the past talking about the model of offering a minimum viable product first, and gradually building the font from there. As I've spent over a year working on my last project (as it had over a thousand glyphs per style in the end), the model of investing time as a "lump sum" - taking a long singular period to complete a project, only after which you can even test if the end product is profitable - doesn't seem completely justified for each project.
As most users would be fully satisfied with a basic character set, from which the design can be expanded later on, the concept of "early adopters" does sound feasible in type as well.
Have any of you tried out releasing through FutureFonts
or a similar service? What was the process like, and would you recommend it?