Rukelion may not have been born to be king but he would be one anyway. Having lived as a commoner for years, he was sure he would be able to do a better job than the bloodthirsty nut currently in charge.
Daisy and the Krinzels had often talked about ever-climbing tax prices. He was willing to bet the king put all of that extra money into the military so he could destroy whoever he wanted whenever he wanted. It was undoubtedly the most powerful army on the continent.
There would be no need for such extravagance when he was in charge. He planned on reducing military spending by at least a third if not half.
He may not have been next in line for the throne but he still had been a prince. He had studied economics, foreign policy, and everything else a future king would need to know until he was twelve years old.
