IMHO it's only a matter of (probably a very short) time before we see our first fatality in the RBAR. As these guys take more and more risks to be the fastest they are flurting with an extremely unforgiving sport. We all know what happens when you push the envelope with aviation, whether it be pushing VFR in poor weather, or low level high G manoevres. The closer to the edge you get the smaller the margins, and less likelihood for recovery if the edge is crossed.