Nobody has a right to have an economic value for what they sell.
This is true. (It's true in every other industry as well.)
But the opposite side of that coin is that if you want people to spend the considerable amounts of time and money required to create new works that are actually any good then you need to have some viable model for compensating them that makes it worthwhile for them to do that. Whatever else you can say for it - copyright has been far more effective than any other model ever tried at the scale of human society in achieving that.
Copyright has generally been extremely effective at giving money to trillion-dollar companies while giving artists almost nothing. This incentivises companies to hire artists and churn out slop. It doesn't incentivise artists to make art. For that, something other than copyright is needed.