There is no sense in pretending. Everyone in the freelance writing community are, as Paris Hilton once put it, frenemies. They are superficially friends, but enemies when it comes to vested interests. The friendships are actually networks. Networks that ensure that a writer who does not have the background, capacity, or capability to write a specific order, manage to keep a hold of the order and make money from it. Even if only a percentage as part of an intricate referral system. That's not to say that such a set-up is bad. Since everyone involved benefits from it, there is nothing wrong with it.
However, asking a new member to to bow to senior members of the forum just because they got here first is incorrect. Respect begets respect. Nobody comes here looking for trouble. The so-called seniors are the ones who normally start picking on the newcomers who are just minding their own business.
In my opinion, it is best to simply ignore one another provided nobody steps into the territory of another writer by trying to poach his clients. Build your own market. The seniors already have a reliable list of regular clients. Simply ask the student if he already has contact with a writer at this forum and how long the professional relationship has been in place. Based on the length of time, a new writer may or may not decide to take on the student. This business is a free-market and the rules of the free market should apply to a certain degree.