I already talked with you Caspel, but it looks like you're gonna make me get a Twitter account now because I want that shirt...
Wait, the way you worded your bolded part is saying that I said that any retail PC game can be downloaded on Steam - I'm saying that if it's available on Steam, you can buy the retail version, enter the DVD/CD key in Steam and get it linked to your account there as well to be able to re-download it at will...
But if I'm wrong with Mass Effect 1/2 either way, then my bad...