If you are only ordering one serving of alcohol per day, then yes, it is only a dollar or two. I don’t think the OP was asking that. I suspect that those ordering several drinks will incur a price of much more than a dollar or two a day. The price of a drink should not be priced at the whim of the bartender - unless of course, the bartender is lowering the drink, but I bet that never happened. Changing prices on a whim - for anything in any business - is not acceptable by any standard - unless you think, for instance, the HAL can market one price for a cruise but change they when you book the cruise at the whim of the HAL cruise agent. The menu is a contract - a legal representation of what the ship will charge you and not subject to the whim of the bartender. But again you are only ordering a drink a day and so that is why you are not concerned with a dollar or two. The prices on the menus constitute a contractual agreement - an expectation of what to expect - not subject to whims of employees to cha he that. I suspect HAL makes more revenue by virtue of a dollar here, three dollars there, for every passenger every day on each ship. Having bartenders change it at their whim is unacceptable and a devious business practice. But again it doesn’t bother you because you only order one drink a day.