Whew I finally beat lvl 4, with 101.07% to 84.86%!!
Here's a hint, watch the icons above the people passing by. That icon tells you how much money that person has left to spend. If they don't spend it all, you aren't charging enough. If they do spend it all, you need more seats.
potential is there...if the bugs get fixed. I had a battle where the enemy outnumbered me 6 to 1, but for some reason when my troop number hit 0 they started to *up* when damaged, lol.