The problem to me is that the KKW black belt is conveyed in dojangs to be a big achievement and worthy of $600. But then, anyone who shows up regularly gets it regardless of ability. So is it a big achievement or not??? The Black Belt is only portrayed as the beginning once you get it...before that it is conveyed as the big goal.
As an aside, I've been asked why I don't test, and the reason is simply I want to perform to a certain standard before I get the black belt. (That standard is probably about the top 10% of the typical KKW black belt candidate).
IF you charge $600 it should be a big achievement. If everyone who shows up gets the black belt, don't charge $600. Don't make it a $600 attendance card