As Japan, that American 30 IPC bonus is a pretty big deterrant, especially considering that their income is already in the 50’s before it’s added. I think that the German and Japanese players are going to have to have a discussion before the start of the game as to when to awaken the sleeping giant. From what it seems to me, Germany will benefit hugely from keeping US and USSR out, while Japan wants them in as soon as possible.
The US bonus is 40 IPC.