I always welcome the option to purchase items a la carte as opposed to a fixed package, which is exactly what these discount airlines offer. What advantage do I gain by being essentially forced to pay for luggage, food and drinks, a printed boarding pass, seat-back pockets, etc... with every ticket. Most times, the only benefit I want is safe transportation from point A to point B, which is what these airlines offer.
Would you be happier if every restaurant forced you to pay for an appetizer, beverage, and dessert with every main, or would you rather have the option to purchase them only if you want them?
I have never flown Ryanair, but I've flown Spirit more than a few times, and I was very thankful for the opportunity to fly r/t to FL or CA at a fraction of the cost which the legacy carriers were charging for that route.