Both :) We'll be using a "Sketch-style" pricing model, licenses work forever, but updates are only for a year.

I'd say that most developers are like you, invested in one editor. It's hard to change, especially given how much customization is possible. Chime's really tailored to people looking for a dialled-in macOS experience. Usually, the people that want that kind of thing are out looking for it. It's pretty niche.