Most RS500's are tucked up in a nice warm garage from what ive seen, most LC are out there on the road in use, therefore more like to get spanked into something backwards (i know that sounds ironic coming from the previous owner of one of 52 moonstone rs500 shells that expired exactly that way, lol)
So i dont really think its a safe assumption which there is more of the LC left really.
They arent average cars, so laws of average dont apply!

Whichever it is, they are certainly of the same order of magnitude in terms of numbers and just as unliklely to be spotted in your local tesocs, so i stand by my "just as rare" comment