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Price is determined by how much someone is willing to pay, not by how much you might have made if you had a different business model.

There is no magical formula in determining how much someone will pay beyond offering a price and see if anyone bites. It may turn out that $14 is too high and they will have to temper their expectations later. But maybe $14 will turn out to be just fine and people will be quite willing to spend that much.

If you are using Meta properties so frequently that you notice it has ads, it is likely that you can find more than $14 worth of value from your usage. If you can't even muster a paltry $14 worth of value from using it over the course of a month, why are you using it at all?