I agree with the sentiment. But, it should not be illegal to lie about your inventory. As long as you are receiving what is promised by them at a price that you both agree, its all fair game.
I don't understand this position, how is it not a form of fraud?
Atleast in the EU it even is forbidden to use false information ("only X rooms/seats/items left" if that isn't true) as a sales tactic.
Deceiving the the other party is a market failure of asymmetrical information. Like being told about a car being all peaches but it's actually a lemon. It's unlawful in most developed countries and is a great way to get a fine and/or a prison sentence.