Catalyst - 4:56 pm on Nov 29, 2011 (gmt 0)
Having multiple clients in the same account is a very bad practice for this exact reason. All it takes is a couple mistakes in a couple accounts and your entire account gets suspended, which hurts all your innocent client listings as well.
There are many subtle Google Places rule violations that can get you suspended and you would not even realize you did anything wrong. Most rules are designed to combat spammers and fake listings but sometimes innocent businesses (and marketers) do the same things without even realizing it.
I'm a Top Contributor at the Google Places forum and if you were posting there I would ask for links to listings so I could check them out and could tell you what all the violations were, but I don't think you can post the links or details here.
But I doubt it's any of the things you mentioned in #1 - 5 above. It's usually other things in the listing itself and again it only takes 1 or 2 listings to have violations and the whole account gets suspended.
If you want to post at the Places forum so I can look at the listings, I'm happy to help. The only hope of getting your account re-instated is to find every single violation (as well as breaking of unwritten Places rules) clean them all up and then try to get reinstated.
ALTHOUGH I don't see a re-inclusion link in that screenshot so that could mean the account is toast.