An Olympic-class hull makes an expensive cruiser

How should a fictional 1910 navy use and arm an Olympic-class hull advertised as unsinkable?

Use it as a 6-inch and 4-inch armed cruiser, but expect high costs and consider a conventional armored cruiser instead.

The fictional 1910 navy is offered a cruiser role for an Olympic-class hull, armed with 6-inch and 4-inch guns. The response immediately warns that such a large liner-derived vessel would be expensive to operate. Even within the imagined setting, the supposedly unsinkable hull does not make the proposal attractive. A conventional armored cruiser is suggested as a more plausible alternative that would cause the navy fewer problems.