The most expensive paintings are from dead artists ... the longer they are dead, the more expensive.
Limited supply? Zero new supply.
A living artist may not be able to exactly reproduce his existing works but he can create similar new works.
Once he's dead, the supply is gone forever.
Every work of art lost in a fire or otherwise destroyed is like a bitcoin with lost keys. There's no replacing it.
Of course if Van Gogh's "Sunflowers" were destroyed in a fire, all remaining Van Gogh paintings would increase in value, just as every lost key increases the value of Bitcoin.