Lots of comments on this thread about Branson being a single data-point, or unsuccessful people do this too. Want a second data-point? Bill Gates. He did it ti

Lots of comments on this thread about Branson being a single data-point, or unsuccessful people do this too. Want a second data-point? Bill Gates. He did it time and time again. First with porting Basic to the Altair, then with selling DOS to IBM. I hadn't thought of it before, but Gates is a very early adopter of making sure you're building the right product by selling it to the market first (do we have a name for that philosophy)?