At the heart of the issue is the freedom to make a contract with another individual without government sticking its omnipresent nose into it.
Should motel owner charge more during a disaster? That's a moral decision he must make.The customer always has the right to appeal to the owner for a better price, we do it every day.
If society feels they were gouged during a time of disaster, they always have the right not to patronize a business or to picket the business. When it comes to prices, society should make the determination, not government.