Okay, so, we found out that Ventrilo has an eight-slot limitation. Unless I want to start my own business and host a thousand-slot-plus commercial Ventrilo server, I've decided to switch to TeamSpeak, which has a 100-slot limit. It seems to work just as well as Ventrilo, minus the elitism. It's not as pretty, but what can you do?
Consider the Ventrilo server officially decommissioned. Fuck 'em if they don't want non-commercial-class users.