Well I don't know what your winrating is but I'd say 150 GE is all I'd win with those wagers as well because my winrating is 55%-60%
Ofcourse I almost only play tanks and I don't know how much higher the winrating can get in planes
I never lose. I either win or I learn.
Where possible use the lowest ranked vehicles you can when playing a wager, this will set you against other lower ranked vehicles. Many of those lower ranked vehicles will be owned by less experienced players than yourself and if you are in a 4 man squad that plays well as a team you can seriously improve your alliances chances of winning - but don't forget that others on in your alliance will also be less experienced than you and so nothing is guaranteed.
"Next to a battle lost, the greatest misery is a battle gained."
Duke of Wellington.
We did golden wagers with 4 man squad before and some times you win some times you lose.
Anyway make sure that the 4 man in your squad know what they are doing and are serieus and good players
"Every one of these cracks, every one of these chips holds an epic story.You can try to take us down, but there is a reason we're still standing strong."
War Thunder Sgt