If game is on GOG, then I can buy it here with no doubt, only with one question - which one first, A or B? ;)
If not, then the game should meet my high requirements (I still abstrain from buing the Skyrim :D) and I need to really want it, before I start to think about buying it on Steam or other platform ;) Most of games on Steam I have from CD-Action Magazine as additional bonus (currently they paused giving games unfortunately), and also from free giveaways (Humble Bundle, Community Forum, etc.). I still didn't achieve the $5 barrier there ;) But I still have that kind of feeling that these games are not mine, because of DRM, so sometimes I can buy it again on GOG, when some good deal will come ;) I think the GOG Connect service could be extended by premium option, I mean, you could get additional discounts (eg. 5-10%) for games that you already have on Steam. That would be great ;)