There's another caveat. Just look at what happened to textmate, it was closed source many of us paid for it. The author decided to rebuild everything and we didn't get any real update for like three or four years. And yet we couldn't do anything about it. And yet it didn't met the community expectations.

Seriously, building a code editor is a massive amount of work, having it open means you'll find someone to help if you don't have a massive company like microsoft behind you.