If Russia is cashing in 35-40 IPC a round, then kudos too you. I’ve only managed that in KJF games against players who can only handle the axis if they are defending against a KGF strategy.
If you mean Geramny cashing in 35-40 IPC, I have to say that 16 IPC is a significant impact. Russia is defending which gives them an advantage IPC for IPC. Coupled with Germany taking on two or three allies at a time, they don’t really have cash to waste on naval units that they don’t need.
As for “losing 36 IPC” at the cost of “20” as you so aptly phrase it, perhaps you should look at the opportunity cost:
Germany is losing the ability to transport two infantry directly to Norway/Karelia from Germany. However, how often does Germany actually do this?
England is losing their entire Air Force on top of needing to build transports and warships to attack Europe. It’s hard enough to build the transports and warships needed to attack Europe without needing to build the fighters.
So on the one hand, Germany is giving up units they don’t need and never need to replace for units England desperately needs and almost certainly must replace.
Sounds like a good trade to me.