The problem is that they are gonna lose that tiny percentage, and the pirates will still pirate the game anyway, therefore DRMs only purpose seems to be to make them lose sales, tiny as they may be.
The offline thing matters to me because I've had people play games on my computer with me and I've had an unreliable internet connection, sometimes even both at the same time, and that's why a pirated copy would be better under those circumstances.
Also, may I remind you that Assassin's Creed Brotherhood for PC didn't require an internet connection to be available all the time the way Assasin's Creed 2 did, so presumably that whole thing did affect their sales in a non-insignificant way.
Basically Bal you seem like a very reasonable person all the time, except when you're sucking the dick out of various DRM schemes for some reason.