Banking gold, each one costs 30mil but when you go to sell them you only get 22.5mil back. So while it keeps your gold safe from everyone save the Devs, it comes at a price.
Is there any use in a build which involves building offensive attack buildings (such as cf's) then equalizing the stats using defence towers? If so, why?
BFE goes completely to raw stats. 2% to your BTA. To transfer 1b gold you need between 10 and 15b. The use would be a large static defense to protect yourself when you are troop pinned. As for a reason why you would do that, beats me.
To (hide) your static defense. Maybe a little deception. Obviously it can be easily discovered. Other than that, no, there is no use
It's like this: [.url=put the link here] this is where you want the thing to say there name or whatever