Hire allies. More money in allies = more money made per attack. Overtime this adds up to a lot. It's how me and all the other lbers started out.
There is no castle code. No castle upgrade. Scout anyone; level 1 castle. You can't do anything with, to, or about it. Do not bug the devs or us about when they'll be an upgrade. It is also easy to fake screenshots. But scout; it'll all be lvl1