Well in any case Here's two expoits/cheats/whatever---hope you like them:
I.
In many places in the game you can "warp" through preventative fencing by logging off while holding forward(until you are fully logged out), then logging back in immediately holding forward [EDIT] until[/EDIT]l you are fully logged in(done syncing).
One such place is in MB center to get into the stripper area
Another place is in MC5 between the hill and the building. Run up the hill till you get stuck<between the wall and the hill> then pull this trick. When you log back in you will be ontop of the mountain that you normally cannnot get to.
NOTE: This is only as useful as you make it. I warp ontop of the hill to kill the guards outside MC5, and warp into the stripper joint just to impress people lol.
II.
This second way is a sure fire way to make loads of money..so long as others don't do it too much and get it patched out:). Do the Biotech EPIC all the way through the 5th mission. You will receive the Move-On chip which sells anywhere between 3-5Million nc. Switch factions and switch back (costs 600k nc). Rinse and repeat...

...well enjoy.
I am doing this one right now and loving the money.