Airline first class hasn’t been for the wealthy in 40 years. Domestically, it went from a place filled with upgraded upper middle class middle managers to a place filled with people who have $40 or, sadly, people who have $40 available on a credit card.
Whether or not first class is ‘worth it’ depends, of course, on how much you value it and on your available funds but the modest increment means the extra cost is frequently easy to justify.