I just power leveled LW this weekend from 1 to 440. For those last levels I just bought all the arctic furs, frozen orbs, and the icescale and jormunger I needed to make epic leg patches to 440. It requires an upfront cash availability, but I sold every one less 2 of each kind for the guild bank and still made a profit. They sold in less than 24 hours.
In my opinion there really isn't a need to get past 440 as you can make every recipe available at that point. You'll eventually hit it making epics for yourself and others however, but there is no real reason to purposely try to go past 440.