Prospector, I belong to the Freeport Tuna Club and can tell you 1st. hand that a LOT of information is shared among members. There is also a certain amount of information that is not shared as well, it's a game, and yes, there is competition.
This may not apply so much to surfcasters, but if you are out on the water you can never know too many people, you never know when something might happen and you may require a helping hand.
Many times, esp. when inshore fishing, information is shared on where the fish are biting. I have been in the bays, inlet, and out in deeper water where fellow club members might be catching and they will let other members know where they are, and what they are doing. This can sometimes make for a good day in what otherwise may have turned out a not so good day.
Our club is also very family oriented and have many functions, derbys, etc. for the kids, weekly BBQ's to exchange information, crew up with other members, etc.
The Freeport Tuna Club has been around for over 60 years, and is a very well respected club, not just on Long Island, but on the whole East Coast. I suggest you visit www.ftcfishing.com
not only to learn about our club, but what clubs may offer in general. Take a look at our club records, many of which are I.G.F.A. records, we have a LOT of good fisherman, some of the best around, and you can learn a LOT from these guys.