Simply by editing all references to MAX_MONEY_AMOUNT in the core, as well as how money is handled in trades, the auction house, as well as the structure for items... I was able to raise it from the maximum of an integer (2147483647) to 421,000-something. It's definitely difficult but exceeding that value would have required moving to the database, as well as the client. I simply rolled my source back to an earlier point and decided to go with the workaround route.