I have been a long time GalCiv customer and love the game greatly. I do not get to play it as often as I would like but anytime I have a few free moments I play a few turns.
I recently bought (last week) Sins of a Solar Empire via impulse. I know I am almost a 1 year late in coming to the party but when it came out I was still deep into GalCiv love and I had a hard time dealing with the fact that it was not enough like Homeworld.
But all of that is water under the bridge. I buying SoaSE it caused me to wonder. Just what is the life cycle of a computer game anyway? I know they are getting ready to release a small and cheap enhancement but besides that how does shelf live and revenue compare between games sold at the store vs through something like Impulse?