Perhaps an amazing text editor is a project that's easily given to being a one-man-show. A single developer writing code and then thinking, "I need to make myself a better tool than this".
The wiki gives a good overview of the problems with current Vim https://github.com/neovim/neovim/wiki/Introduction#problem
I was wondering whether Neovim would end up as a one-man endeavour too, but it seems like a pretty lively project with loads of other people involved - I'm really looking forward to seeing where it goes next.
Second, ST is not based on a freemium model. Only the betas are free (and that only as long as there's no stable release), for the stable versions you have to pay.
Second, the fact that since ST2 he was able to hire a second person to help him with the business side.
I bought ST just like many friends did. Sublime may be selling about as much as RubyMotion, which invested the proceeds in hiring very few, high-level coders that seem to be fully inline with the founder/original author.