Personally I'm not willing to invest in games I could lose access if they decides to pull the plug. I suppose they'd offer some kind of license transfer or some kind of compensation if that happened, but to me it seems like a risky deal from a consumer point of view. I'd be less worried if a purchased game was made available on alternative stores right off the bat.

With Steam I guess I'd be able to find a crack to get the games to work if Valve goes bankrupt, and with GOG I don't even have to worry about that because the game installers are DRM-free.