I do have a bit of an issue with buying the argument of 'beeing fit enough' to do multiple games in one day. The way I see it if you have something left in the tank after doing the first game, you haven't run hard enough or haven't put the Sprint for the long balls etc etc. If you give your first game 100%, all you got, then surely your second game won't be 100 %.
Don't compare your fitness to others who are less fit than you, compare it to those who are more fit, or even to yourself when you only do one game.
If you are doing it for coverage, then that's a different matter. So long as you RA, teams, clubs and the competition organisers are happy with it then I'm am fine with it.