After reading the previous posts yesterday, I did some research on the subject of AdMob accounts being suspended / banned. It seems that this did used to happen a lot, but in the past 12 months or so, it appears to have slowed significantly. It does still happen, but it seems that it doesn't happen as often as it used to. Still not sure about reasons though...
They warned me about copyright things and don't let my app display ads from AdMob. I switched to another ad network and it lived for 2 more years before they kill my account.