Fictionvision: Just insane for it to be selling so well.
Not particularly. Loads of people who don't have these games, either not on Origin, or because they are sold on Origin, or because they simply were still too highly priced (particularly outside of the US)
Add to that it's getting stockpiled for selling the keys of relatively valuable games both Steam and Origin. It's no surprise this thing is selling well.
For EA particularly including Sims 3 was a smart move, as it makes it extremely likely people will pick up the expansions on Origin instead of Steam, as to get them on Steam, requires the base game on Steam. Preventing that sale basically prevents the expansions being sold there as well.
And of course in itself it'll be raising the amount of people who have some games on Origin by a large amount.