I'll only quote the fifth sense of the prepositional form of the word. I find the expressions built out of this sense of the word to be very pleasant. I'm not sure precisely why.
5. Repetition of quantity: Once repeated; as much again = this and as much more, twice as much; half as much again = this and half as much more, one-and-a-half times as much.
Listening to: Cowboy Junkies - Lay It Down - 02 - A Common Disaster