Real art is original. It is of extremely limited supply (only 1). That's why it's so valuable. Like Bitcoin.
I'm not much of an art person, although I have made some original art myself, but then I'm a no one so who cares about "Dabs' painting" right? However, I do appreciate some certain replicas of not so famous art paintings.
There are even markets for these, original oil hand paintings, but obviously mass produced and copied or inspired by greater artists of the past, plus they are cheap too. However, because of that, they aren't very valuable more than a token amount above the cost of materials and the time to create them.
The most expensive paintings are from dead artists ... the longer they are dead, the more expensive.