They have checks for modified money, playtime and level on v9, i wouldn't suggest doing that. Instead you could use a script to make your life easy, go and shot down some helis until you are rich. Will take some time but will do the job just as fine.
Also KOTH v10 is a no go, they have way more stats saved server-sided, they can check almost everything you did that gives you XP and $, from headshots, the distance you killed the person, how many of each vehicle you destroyed etc.
If you suddenly got a huge difference on your profile you will very likely get banned due to incosistent data, this doesn't even need to be related directly to ArmA 3, they only need something to check the DB every once in a while. In v9 this isn't a big problem since most of it is stored in your local profile but there's still some checks that happens in official servers. Not sure about community ones.
Anyway, KOTH scripts is an old discussion, i'm pretty sure you can find everything you need to test these things here or on other forums. Good luck.
(I know it's an old thread but i just wanted to leave this info here for anyone that wants to try it.)