It's not just the airline industry but everywhere and driven by customers who know the cost of everything and the value of nothing.
What has always perplexed me is why many people are very willing to go and spend £/€ 60000+ or whatever on a new Range Rover or BMW, which will halve in value in 2-3 years & be worth scrap value in a dozen years time but quibble and bitch about a few £'s or €'s on an air ticket.