Having read this thread, I've come to realize that there are some who are quick to label sharking as cheating but I suspect that most of them have done it themselves and didn't even know it.
Pool is not a game played by robots who simply approach the table, shoot and then sit down. This is a social game that often involves interaction between the players on multiple levels.
Since the vast majority of all communication is non-verbal, everything you do can be interpreted in one way or another and as such has the ability to influence your opponent.
The vast majority of sharking techniques are never recognized or easily identified as sharking tactics by the opponent!
The fact that some people are able to use subtle techniques to gain an edge is a part of many games and sports. That doesn't necessarily make it cheating. Strategy is multi-dimensional as well.
When boxers verbally demean their opponent...no one cries foul.
When hockey players slam an opponent into the wall even though the puck is at the other end of the rink because he wants to send a message......people cheer.
When a poker player starts dickering for information in a "heads up" challenge because he's trying to illicit some information on whether to call or fold......nobody penalizes him.
Look at Earl Strickland's behavior.....Is picking a fight on a regular basis a form of sharking?
Minnesota fats was known for talking incessantly at his opponent during play.....and yet he's one of the most beloved pool icons. Isn't this sharking? If so, why would we reward this "cheater" with such accolades?
The same thing applies to pool....it's a social game that involves social interaction. If you're able to use that interaction to your advantage, without breaking the rules, then you are simply playing the game at a higher level.
The real challenge is knowing where to set the limits on what is subtle enough to be effective without crossing the line of acceptability.
That line is always moving based on what you know about the area, your opponent and even the game.
If you fail to recognize the influence of social dynamics or "sharking", even in it's most subtle form, you are destined to always be its victim and not its beneficiary.