I have 7 workers at this moment. 6 workers to work on the defense and 1 worker to dig the dungeon.
My towers and barricades now cost 2-4 million gold to upgrade. Gold farming is difficult, so I mainly get my gems from farming tapjoy and buy 12million gold once reach 2400 gems, instead of attacking bases with the risk getting looted.
It is tempting to buy +3 workers package, but do I really need 10 workers. How many do you have? And how many is enough?