If it's to keep a piece of paper hidden, then yes, the expense seems inordinate. But try looking at it from another angle. If, as other posters have suggested, he's playing a combination of rope-a-dope and the Long Con, then half a mil or even a million or more is a modest and entirely reasonable investment in a gotcha that, barring catastrophe, he can spring on us 36 months from now.
Regardless of what may or may not happen in the short-term regarding this matter. The end result has already been determined and cemented! And, it will not be the future that those who created the current situation predict. Those who I am speaking too know who they are. Your front boy will meet the cemented future with loving arms, as well as its puppet handlers. Sometimes Love needs to be tough Love, and discipline is on its way. The beauty that the future holds, is that it is unpredictable and at the same time a foregone conclusion.