No general arma 2 mod/cheat section so going to post this dupe here.
Requirements: A semi shit computer that can get some form of lag on Arma, the worse the better
Steps:
1) Change graphics and view distance to max
2) Drop money
3) Spam enter to pick up money over and over again
4) repeat
Game processes your actions but does not go through with them because of the lag, so you pick up the money twice. Ez money.