income from nerd attacks in long periods

This morning just over 2000 elixer and 900+ gold. I make a point of having maximum nerds available to send on random attacks overnight (1 nerd per building). With 45 nerds currently available from my 3 castles it mounts up quickly. During the day I'll split between friends and random. If you attack me then I WILL get you back (good for both of us). I guess it must be OK as I've got about 9000 gold and most of my friends are on the 2-3 thousand mark.

EDIT: very impressive spo0ky_lu.