Imvho, sharp vs. square is an ego thing. "I'm a sharp. Give me $10K on the Packers tonight. I'll be in the bar, waiting for my money." Right. I agree with others in the thread. It's really guys who make money vs guys who don't. To me it's an instinct deal. Knowing when to pull the trigger, knowing when to pass. Knowing when to up the ante, knowing when to get small.
Even keel is my goal. Long since off the hurtful emotional roller coaster some young bucks now must ride in the rites of passage. (forcing the action, playing too many games, as if there was no tomorrow) For me, 2-1 is a good day. Getting the best possible line is paramount, basically a given. My definition of a sharp would be a mob family betting heavy on tonight's game. But those guys are only sharp when they really want to be.