Ok, this is getting out of hand. WBL is a guideline included in the DMG that gives you some sense of the assumptions the game designers are making when they think about what constitutes X or Y level. For character creation purposes, most of us have adopted that as a heuristic, saying that when we make a 10th level character they are entitled to whatever that chart gives them. And, usually, we let people pick it, though various people may have their own take on that one.
People on this thread are instead acting as if it is hard-coded in the rules somewhere. There is nowhere to my knowledge in any of the rules -- DMG, Rules Compendium, SRD, where anything along the lines of "if a character uses a crafting feat, skill, guile, etc. to gain extra wealth you should have those gnomes from Golden Axe come and take it away." If I am mistaken, please show me the text contrary to it and I will shut the hell up. But, the quote that Kajheera has thoughtfully provided kind of illustrates how it is a guideline based on general assumptions, not a gnome-fueled hard and fast rule.
Personally, I think the idea that it is so hard-coded fails due to reductio ad absurdum. If I am restricted to the value of my WBL, no matter what, then any crafting feats, feats that reduce crafting costs, and so on make no sense. The second the wizard scribes a few scrolls he's off the WBL, and the resources should be stripped from him. Further, Bob the Master Performer and Joe the Fighter w/ no Skills should have the same exact amount of change in their pocket? Why bother listing the monetary values for crafting and performing and a host of other skills? What about the Mercantile Background feat?
Now, I can totally get behind the argument that for the purposes of a CharOpp discussion saying that you can have crafted whatever you want, and effectively double your WBL, might be unrealistic. On the one hand, you are paying w/ the cost of some feats (so there is something lost there), but on the other hand it's unrealistic w/in the context of an actual game (perhaps, arguably). That's fine. I have my own personal inclinations, but whatever. For the purposes of a CharOpp discussion, or for a given campaign even, just pick a set of guidelines and go w/ it.
For the purposes of this Legendary Fighter thread, I'd probably just say ignore crafting and let people have whatever items they want. Doing otherwise probably stacks the deck too far in favor of spellcaster types.