I don't know about the overall market analysis so I'm not commenting on that. But I do know that personally, GOG meets my needs in spades and Valve doesn't, so I've spent a lot of money at GOG and will for the foreseeable future. I am a Linux guy and don't own any Windows machines. I couldn't care less about the Galaxy client. To be honest, I'm not even sure what it does -- I just know that I get along just fine without it.

For me, GOG is as close to perfect as I've found.