You Might As Well Get You Some Extra Coins by Selling Some Goodies
So now you know how to pack your digital wallets with Diamonds. Now here's one method that's sure to increase your Coin intake - take a peek through other farmers' newspapers. When you spot some construction equipment like dynamite, purchase them in bulk. Since you'll be selling them soon, pay attention to this next step - sell each of the items you purchased in bulk between 180 and 220 coins a pop. Selling off these items should get you some extra coins in the long run. For the final item being sold, advertise it. Once folks take a trip to your in-game store, that ad will make all of the items you're selling public. You gotta invest to get richer, right?