To play devils argument. If someone with a valid RAP (and has it for legit reasons) is allowed to take 3 people on the ride with them. Isn't it up to them who they take with them. If they decide to 'pimp' themselves to others who decide it works out cheaper then paying Merlin/Disney for their official fastpass. ie a RAP uses charges the group £50 each for the day instead of paying Merlin £10 per ride. Now I'm not talking about the morality of that. However as far as I can tell non of that is against the rules of RAP. The RAP user is allowed to take 3 guests on with them. There are no rules about them being related (or even friends) the can choose whichever 3 people by whatever criteria they decide. So again if people don't like that, thats the rules of the 'game' over the 'player' utilising them to their best advantage.
BTW: I'm deliberately being a bit provocative with the comment above as part of this debate, I'm NO WAY saying people SHOULD do that I'm just saying there is NOTHING to say they CAN'T