Note: This site is in no way associated with Facebook or the game's developers. It's just one fan's tips and strategies.

Expenses

'A man in debt is so far a slave.'
  - Ralph Waldo Emerson

One area that is often overlooked is reducing your expenses. Here are a couple of tips:

Stockpile Expense Management
Only keep the items in your stockpile you absolutely need to 1) do jobs, and 2) arm your mob. Remember, your mobsters can only carry one weapon, drive one vehichle, and wear one peice of armor. So having a mob of 30 people yet having 200 grenade launchers does you no good. As you become richer, this becomes much less of a factor, but it is HUGE when you are starting out.

Free Items
As you progress and pull jobs, certain jobs will have the chance to drop 'special weapons'. These weapons are generally more powerful than similiar level weapons you can purchase, but best of all, they drop for free and require NO UPKEEP! So collect as many of these special weapons as you can, and it will limit the number of arms you will need to purchase and maintain.

Hits - Are they worth it?
This one is a bit subjective, but don't let emotion get the better of you in this game. Hits can be very expensive, buying hits on everyone who attacks you once will drive you right into backruptcy. Pick your hits carefully, check your ego at the door, and everything will work out for you in the long run.

Don't Bank at Higher Levels
As you progress in level and gain wealth, the money which can be stolen from you during attacks greatly dimensions, and the amount the bank takes to launder and protect your money increases. After about level 30 it really isn't worth putting all your money in the bank. We will expand on this point in the next section on the bank.