Obsessed :noun. (psychiatry) a persistent idea or impulse that continually forces its way into consciousness, often associated with anxiety and mental illness. a persistent preoccupation, idea, or feeling. the act of obsessing or the state of being obsessed.

Doesn't this describe smallcapsmarket perfectly?

Everyday... Hundreds and hundreds of posts. He can't take a day off. He can't let it go. He is obsessed..and as stated probably associated with some other mental diseases.