I find that PCs rarely gain wealth at the same rate. Sure, they usually each gain an equal share of the gold and mundane goods that they manage to acquire in their travels, but rarely are the magical spoils the same from one adventure to the next.
I usually eschew the PC wealth by level guidelines, allowing the PCs to generate as much gold / magic / property as they feel the urge to.
In the campaign that I am going to be starting soon, however, I'm thinking of having the wealth by level guidelines at less as a metagame concept and more of an in-game limit. The characters can accumulate as much equipment as they like, but they can only make use of X amount of magic at any given time, based on the wealth by level guidelines... I am unsure, at this point how I am going to maintain that rule with respect to temporary, disposable, and one-shot magic items...
Later
silver