The most important thing here is to trust your employees. I mean seriously, why would you employ someone you don't trust? There are tons of trustworthy people out that that woud love a job. Picking a good employee is tough, believe me. I have had employees steel from the company, abuse their position and be rude to other employees. I will not tolerate that. If I feel I can't trust someone, sales, support, admin, whatever their position, they are gone.
So yes, your original post is about trust, as you wouldn't be asking us this if you trusted your employees and you wouldn't find it so hard to figure out what privilages they should and should not have.
You also do not need to play dirty to get money. If that is how you operate, I wouldn't buy from you. Yes, I am being blunt and honest. Believe it or not, there are honest, good hard working companies and CEO's that do the right thing and work hard to build their brand. You seem to be playing the Mafia approach.
Good luck!