Most likely the Linux-market for a tool like Gamestudio is even bigger than the Windows market. It`s about target group-oriented thinking and getting a unique characteristic to Gamestudio.

By supporting all major PC operating systems (which Unity doesn't), it's not just exposing us to a 15-20% larger market - it's exposing us to markets where games and game developing suites and engines are relatively spare and people are plentiful and desperate.