True, however we do not play games with 7 players, because it's not showing who's the best player only who's the most lucky player
We play different kind of games, but we count towards our ranking only games played 1 vs 1 or teamers with equal count of teammates: 2 vs 2, 3 vs 3 etc. Then you have something you may compare and that's the idea of ranking.
Here's football analogy, that was used by one of our clubmates: could you imagine Brasil playing football on a football pitch which is not flat, with 7 gates and 7 balls? Do you think that Brasil may win such event? Or maybe that 6 other teams will gang up and score 6 goals?
Of course beside ranking games we also play FFA games, it is also intersting option, but only for fun, not for judging who's the best player.
About RTS - I really don't like the idea "who's the first one to jump into that forest on a hill" or sending reinforcement to city during my attack or double move and many other things that are used in ctons as a normal thing. I know that there is no way to eliminate it in ctons, but I do not acept this kind of game.
Back to the main subject - if you are interested in starting in this event, sign up for international qualifications, which I think are still open.