It’s an important economic concept that often lost or flat denied. Artistic “worth,” moral “worth,” and practical “worth” are all concepts we can discuss philosophically or emotionally, but economic worth is what someone will give you, in a free exchange, right now.
The dress I’m wearing was “worth” about $40 when someone bought it new at Dress Barn. When she donated it to The Salvation Army, it was worth zero. When I bought it at The Salvation Army, it was worth $2.50.
Ah, but she got a tax deduction. Think she took the full $40? :-))