Sharking is bothering your opponent to take him/her out of their game ro give you some advantage.
People that shark are idiots. Besides that, it's a dangerous endeavor. I know a guy that was killed in a pool hall parking lot for blowing his nose when the other guy was shooting. He was well know for doing things like that, and he eventually did it to the wrong person.
Hustling is hiding your real speeed/ability and getting away with it. If your opponent loses his money does he eventually catch on in either case?
Not if the guy (hustler) is professional about it. I could walk into town and hustle you and it probably wouldn't sink in for for a while. Hustling is an art form, not a past time. Not everybody can do it, and even fewer can do it well. It is not only hiding your ability and speed. You need to be able to raise your speed gradually where you can win, but still go un-noticed.
This is a lost art form these days. Today, most guys walk into a room looking for action, and automatically draw attention to themselves. It's the difference between the Fisherman that fishes conventionally, and the idiot that sticks his head in the water bobbing for trout.
Do fish exist to feed the sharks and the hustled to be hustled or are these just rites of passage?
Sharks aren't fed. They are predators and hunt for their own food. There is a difference in what you wrote and what actually happens, both in pool in in the ocean. There is a such thing as a pool hall heirarchy. I believe that players exist in classes, which has nothing to do with their actual playing ability, but to the way they react in certain situations. I won a lot of money out there against better players , mainly because I picked the right guy, at the right time, under the right circumstances, for the right amount of money.
There are lessons that every player learns along the way, but I do not recommend losing great amounts of money to advance in your level of experience. The only experience you'll have is how to get your butt kicked.
I have an article posted at this link:
www.8ball.org/blackjack_gone_fishin1.htm
In this article, I break down the differnces between Hustlers, Sharks, and Road Players.