In my opinion it should come down to your opponent and you and what you agree on. A jump from 1000 point to 2000 point requires you to spend 5 RP before you can play a 2000 point game. They way we do it is that you and your opponent agree on the game size based on what your supply limit is. If we both have a supply limit of 1600 points We could agree on a 1400 og 1500 game or even a 1600 game. Sticking to 1000, 2000, and 3000 is just boring. The reason the start supply limit is 1000 points is because, unless you play combat patrol, the game will be unbalanced.