Well, if you don't charge anything to the room you won't get a bill hanging on your door knob on the morning you leave.
And you won't get clean towels every day, nor will you get daily full cleaning unless you pay for it. And that also means you won't get any more shampoo/soap/etc except for service days. So bring some from home.
Unless you are in an OKW studio or dedicated two bedroom villa (except for BWV), you won't get two queen beds in one room.
Other than that, I'm not sure what you mean.