A vice in common can be the ground of a friendship but not a virtue in common. X and Y may be friends because they are both drunkards or womanizers but, if they are both sober and chaste, they are friends for some other reason.
For me with "The Apprentice," it kind of blew out my business brain. I don't really think of myself as a business person. I think of myself more as a creative-type person, but it's quite nice to be challenged physically and mentally.