Quote from sprstpd:
Now that all the ECNs have been snapped up, no reason they can't just raise data prices whenever they want. And notice how ARCA and INET almost simultaneously started charging for data. What a coincidence! Good thing that the competition between the two is enough to drive prices down!
Who wants to start the next ECN competitor to these clowns? If you get enough orders and survive the temptation to get bought out by the bigger players, then maybe you won't charge for data. That would be nice.