Since the Cannith Casting revamp, dividing by ML rather than by plat value should be a lot easier.
Consolidating the brokers in the marketplace makes sense, but it still won't solve the issue of noone really selling much to Brokers, due to the fact it's more useful to burn for crafting.
People are generally happier to sell good gear on the Auction House, as that means they get the bulk of the money, rather than getting a fraction of it, as happens when selling at a Broker.