Anyone that has played 10 years, especially for money, and says they have never sharked an opponent is a liar, pure and simple.
Some players are weak emotionally, a serious player hones in on this almost immediately. True friends will jokingly try to shark each other during frendly games (< $20 a game). One little comment can cause some players to go to hell in a hand basket. We just call them, 'weak sisters'.
BTW, I was also a catcher growing up, and chatter to the batter was part of the game, in fact, almost every sport I played taking your opponent 'off their game' was just part of the game.
How many of you have never shot multiple safeties in a row, because your opponent is a good open shooter, but really weak at kicking out of a safety, and helps you gain an advantage?
I have been playing well over 10 years and NEVER sharked anyone ever! In fact if my opponent is shooting and facing toward where I'm sitting and I have an itch or something, I alweays make sure not to stcratch it or move in any way until he shoots the shot. In fact, with the exception of one time that I was sharked by this one low-life type I can honestly say I've never been sharked before or if they were trying to shark me I was unaware of it.