Voting is answering a direct question. Yes or no with direct results. Your purchase isn't like that, they're not votes. Business behavior is decided by what is more profitable. That also assumes there is a choice to be made. There's nothing you can do if all options behave the same way.
Your vote doesn't matter if the two options you vote for are the same. Often not true for politics, frequently can be true when making purchases
Post hoc ergo propter hoc
Just because it happens, doesn't mean it is not a big deal.
This assumes that agents in the market are rational actors, which they are not. Even when deception becomes the norm enough fall for the lower advertised prices to make the tactic optimal, despite the tactic's negative impact on marks and savvier consumers' alike.