Why aren't more philosophers interested in Entrepreneurship?
How about just 50 then. Your avatar suggests there's something you value about that time.
Another reason could be as far as why entrepreneurship has declined in general... is that some believe something along the lines of "everything that can be invented already has" and the same with thoughts, words, concepts, and ideas.
I don't think there are many strip malls or plazas I could visit today that, assuming they keep everything in stock, wouldn't be able to keep me alive, happy, and then some for several lifetimes. Of course, for all we know they said the same thing 2,000 years ago...
Seems to be the future is technological innovation. Advancing medicine, computers, science, all that. Not so much neat trinkets or personal devices. Though it will produce plenty.
The idea of a philosopher using his knowledge and insight to "set up a company" and earn money in a way that becomes exponentially easier after the initial hard work up front is what we're talking about I gather.
Well aside from the fact that competition and variety for the consumer is needed to spur innovation and be a natural guard against price gouging, there's always gonna be hard or at least constant work to stay ahead or even afloat. It can be done. With patents. But unfortunately logic alone won't guarantee a successful and profitable business, especially in today's moneymaking fields of technology, science, medicine, defense, etc. You need technical "nitty gritty" knowledge as well. Gotta either learn it all yourself or find someone who does you can trust (which is the real challenge) and go from there.