Safety first. It's a public waterway through the CBD, therefore this is nothing shy of dangerous/careless driving imo. If they need to "train", the wankers can do it on private property. I'm not allowed to take a race car on the public roads to "train" and break the law, so why should rowers be allowed to "train" on a public waterway and break the law??
You only need to look at the way they think they own Lake Wendouree to get a taste of their "my crap don't stink" attitudes. Why don't they receive speeding fines there? Because they're "special". I don't care for a compromise, they can get stuffed as far as I'm concerned.
