Thanks GDuck. I'm "guessing" that the USPTO can deem a request for another re-exam valid or invalid based on the "reasoning" for a re-exam. The USPTO could say: "no they just went through a re-exam and your proposal for a re-exam does not warrant another - or vice versa. Makes it kind of tough if you've got a patent that no one want to see made valid.
How's that for building a scenario with no knowledge - LOL!