WHY HAVENT ALL GROVESNORS GOT THE SAME RULES>>
are they all franchised out

??
because each is run as an an autonomous club with its own p and l from which managers bonuses are paid.
There is a central rules committee which is riven by politics and rivalries.
I am recentlyelected onto a players forum for my local Grosvenor. Its a complete waste of time so far trying to effect change. The whole corporate culture is backward, insular and anti customer service.
Shame, because a lot of the cardroom staff around the country are excellent and frustrated by those above them resisting improvement because "we've always done it like this"