Simple minds

People are easily satisfied with pretty useless and low-quality things. They don't aim for higher art or good sound quality of the rubbish they purchase as "music". Rather they care about if they think it's the best they can get.
And what they think is the best is determined by the industry wanting to make money with them.
Not that it had not been the case 10 or 20 years ago, a second explosion age of consumerism, but factual judgment and experience once had seen better periods where people listened to them.