What do you do if someone is obsessed?

my friend always gets deeply obsessed over things like firstly making money, then doing a talent like magic trick, then having a certain gadget. It is good that he peruses his ideas and in the end he gets what he wants but it takes a lot of obsession to get it. So, i get kind of mad or maybe jealous about the way he acts over things he wants. HE GETS OBSESSED. So can i stop his behavior or do i change myself and how?