Seems to be a loss of exp rate after wave 10... Lots of cash and nothing to upgrade. Its annoying needing to place 1000 worth of 20 gp towers when there are not even any spaces to pave.
Someone said there's no point raising egg gathering past level 25... they are wrong. Each level gains less time between gatherings. That means more eggs and more EXP for the wife.
Keep increasing your egg gathering.
There used to be a cheat (from an earlier post) that allowed you to sell crops and keep them too. I expect everyone above level 1000 has exploited that.
well, don't wait until you have many wheat in the box, and you send less grain to the chickens.