That would b true if the rate of loot out was the same as the rate of loot in.
For example we have pot "p" in everyones storages... And mines add 5 gold to pot "p" every day, players spend 5 gold every day on upgrades that they raided from pot p.
So we have (p+5-5)=p
We have a balance
Boosting barrax players can now raid more and spend 10 gold per day but mines still produce 5. So we have
(P+5)-10=p-5
Every day we will see the pot getting smaller n smaller and yeah some players have the advantage but how long will this last? Every day the players with "the advantage" will be fighting for a smaller and smaller pot



