Van Gogh was utterly miserable though. I don't think he'd consider his life a success.

To frame it with someone I know much better, what about Nikola Tesla? Profoundly accomplished, objectively made enormous contributions to engineering that made huge improvements to the quality of life for a large chunk of humanity. He was utterly obsessed with the pursuit of knowledge and nothing else. On his death bed he regretted his work ethic and wished only to have ever known the touch of a woman.

We may be benefiting from their obsessions, but they aren't.