Dallinor on 11 June 2009
I would imagine there is also a certain level of security in sticking to one platform as closely as Sucker Punch do. Sony provides funding, time, advertising and bundles for their games. Given that they're a relatively small studio, going multiplatform could potentially mean stretched resources, less funding, less quality and ergo less overall sales.
The situation with Valve is a bit different. They have over 3 times the staff size of Sucker Punch, and have no close ties with any console company.
