I'm sorry, but that is a terrible, game destroying idea. The only thing that would happen is the lb would become invincible, quite litterally to the average player.
do u know how long it takes for a lb to make 500 miths ? Do u think many lb would care about 10m bonus which will take them lots of ee to make 500 miths
Considering I have over 2k mith, and I don't war, I'm going to assume that most of the LB that do war, probably have in the region of 10-20k mith. Let's do some maths based on that. Lb account has 20k mith, that's 40 of these upgrades. 40x10 is 400, so from the word go, +400m bfe.