First of all, Van Gogh's tragic experience and his paintings full of warmth and vitality really brought great shock to people. His works have really brought great shock to people, which is why some people will find his transformation after his death and regard it as a masterpiece. He really has such strength. However, in his time, it doesn't mean that such a change is pleasant. A living outstanding painter is no more shocking than an outstanding painter with a tragic experience, so no art connoisseur found him before his death.
The greatest achievement of art connoisseurs in this life is to find an excellent painter, and their lives will be brilliant, so the art connoisseurs who find Van Gogh's paintings are also excellent, which makes more people know Van Gogh. Because Van Gogh has died, his works are limited, so his paintings are more precious and expensive.
And his paintings can reach hundreds of millions of dollars because of the competition between the rich and the arty capitalists. Many rich capitalists express their connotation with artistic taste, so the more valuable the painting, the more interested it is. Under the competition of all parties, the value of Van Gogh's paintings as an orphan has been continuously improved.
This is why Van Gogh had excellent works before his death, but he was worthless and unhappy in this life, because there was a lack of excellent art connoisseurs to discover him and people's understanding.