Would I be right in assuming that a large proportion of the membership at RSG is made up of high nett worth individuals who do not live in the area, and who are also members at other clubs nearer home?
I know several such people who are members at Royal Liverpool or Royal Lytham, but who actually play most of their golf at their local club, be it Stockport, Wilmslow, or in one case Reddish Vale. Their membership at the "Royal" club is almost a vanity membership, used for occasional days out or to impress business acquaintances.
Meanwhile, in the real world, members' clubs in England are generally rammed full on Saturdays as it is Competition Day.
Visit almost anywhere on a sunny Sunday late afternoon however, and you will have the place to yourself!