Like Dee and Kelly chanting and performing the exhausting rites of alchemy, the desired gold comes only when that ritual has been properly done, and Crowley leads us in a similar manner to a kind of "story gold." The proper chant mesmerizes us, makes us see, feel, bite into the soft metal, and believe the gold is real. And while we so believe: it is real. Later, as we are fleeing enemies, as dross facts attempt to draw- and-quarter our imaginations, the gold evaporates. Our fault, not the fault of the creator.
This signals the time to refill our treasure chests by doing the incantation again.