Oh yea, but I make games for a living. It's tailored for making games, and I made it to make games with. It can be used for any number of things as you suggest, but I have a goal and focus and vision and describe it according to that :)

Disclaimer: I work on a game engine for fun. (MOAI)

Game engines are no longer 'games' engines, in my opinion. Its really far better to pitch them as "Interface" engines, in as much as a significant majority of the interaction with the engine is to get an interface on the screen - whether that be for gaming purposes, or application interaction.

These days, the line is very blurred, don't you think?