The "bust" is just part of their cycle. They always needed it to convince the people to accept their new (lesser form) currency. They created the supercycle system (40-50 year cycles) to span generations so it was harder for the people to see their agenda. It was designed as a wealth redistribution scheme to extract the wealth from the people and at the same time use that wealth to fund all sides of a war if the people became too unruly.