I was running three separate buggies and all without lids. After the first couple of minutes, El Destructo saw my reasoning in action and started to run his without lids.
So, NO. The majority of us do not run without lids. The majority of buggies in the pictures belong to me. BUT they are not the only buggies that were in action. Russ was running with bodies, El Pirata was running with bodies (when he was running and not taking pictures), El Destructo started running with a body, Loser ran with bodies all the time, and SkyLineRacer ran with his body on the entire time.
Those running Savages strapped their bodies on after they got things tuned...but they did not run for long. The best proof of that would be the Savage jumping the berm and developing a permanent chassis bend from a nose on landing from 20FT onto blacktop.