I'm not sure "open source" has anything to do with this. Selling developer tools has always been a big risk even when the more likely scenario was another deve

I'm not sure "open source" has anything to do with this. Selling developer tools has always been a big risk even when the more likely scenario was another developer selling a closed source alternative to your tool. Sublime Text itself was very much "inspired" by TextMate back when both of them were commercial and closed source.