One of the aspects of the Pathfinder rules that I never really grasped WHY (and admittedly never really looked too deep into the rule) is WBL. Wealth By Level.
My decades of experience DMing and playing AD&D2d (never moved to 3, 3.5 or 4) something like tracking or enforcing how much WBL a PC had would seem ridiculous on its face.
I have found now with Pathfinder, enforcing WBL is one of the factors that strikes the balance and prevents PC's from cakewalking every encounter at higher levels, or being so poor they are overwhelmed by not having enough resources to handle what should be level-appropriate enemies..
I had not thought about it, or enforced or even tracked it, and had started using DM fudge to up the challenge of encounters for a party of 14th level PC's in a published Adventure Path because there was no challenge.
I see my folly now -- had I enforced WBL, I would most likely not need to fudge anything to keep everyone entertained. Yes, allowing PC's to craft everything on their wish list is fun for them also, but in actual gameplay, it is not often they are in any real danger for their PC's life unless everything is save or suck.
I post this hoping that anyone else thinking about DMing PF will learn from my mistake and actually pay attention to WBL, lest they end up with uber PC's that you are struggling to locate appropriate-scaled enemies for… Or are too lean with gold and treasure and the PC's are chronically handicapped with the adventure or campaign.