How much "view of greed" has fallen on airline companies for fluctuating the price of their seats based on demand? Sure thing it makes buying air tickets a lot

How much "view of greed" has fallen on airline companies for fluctuating the price of their seats based on demand? Sure thing it makes buying air tickets a lot more stressful, but we do get low cost trips if we plan ahead, or a much-needed last time seat if we can afford it.