Darrin Drader
Explorer
Ron said:My understanding is that Prestige Classes are a device to allow WotC (and other d20 companies) to sell more magazines and splat books. If they were a primary tool for world-building, the DMG would offer rules to create them, allowing the DMs to customise PrC to their campaigns.
Rules for how to build a prestige class, how to build a feat, and how to build a monster were released in Dragon magazine following the release of 3rd ed.