I don't see how exactly could such association help the market. Actually, I can't see what would be their interest and how could that reflect in positive way on other users.
Yeah, I also don't see any association whatsoever. Everyone has its own interest here and as much as we think that they care for each other, they don't really care, to each its own.
Anyway, everyone who steps in the market has its own interest and works to realize it no matter the interests of others so some will win and some will lose. No matter to all that I don't think that market could be so much manupulated to fulfill someone's wishes when and how he wants it.
Everyone has its own preferences, but I think the end goal is the same, profit as much as you can even at the expense of others and then rinse and repeat.