Well, yea I know you will not get the disc, but, why is it more expensive? I mean, They dont have to print manual, they dont have to copy all those DVDs, they dont have to pack and send it, they just let you download a few GBs of date, its not worth those 12€ for sure. I dont really care about it because I already preordered my copy from e-shop, I am just curious why does it cost so much.
EDIT: Another thing is the Activate product on steam function, which just lets you activate your game on steam using your CDKey(I dont know if it works for arma 2, but it should), which makes purchasing through Steam completely useless, because you get the box and the ability to download the game anywhere for less money