Why should people not complain if they feel the next higher product tier is a rip-off? You could buy two seats at twice the price to get some more space to spre

Why should people not complain if they feel the next higher product tier is a rip-off? You could buy two seats at twice the price to get some more space to spread yourself over, but that's obviously not ideal. Some people are asking for something better, but airlines might not be aware of consumer demand (or ignore it because they want to sell their higher tier seats, which many people can't afford, though).