Yeah thats basically its biggest selling point, all the money is basically 10 ingame dollars = $1 USD, it's a difficult game though, unless you do research on what weapons or equipment to use based on your skill levels, its very common to be spending more money shooting than you are recieveing in loot, so strategy involves hunting things where the items they drop are in demand, so that you can charge a higher than normal price for them.

There are actvities that don't cost money, but will obtain items that are in demand, so if you have the discipline in patience, you can build up some money in the game, and yes, you can withdraw money you make in game to send a check to you