Banned Or Not Important Enough

[Gracia]

I have a site that has been delisted for about 6 months now.
Initialy I wasn't bothered as I got little traffic as my rankings were not good enough.
However, I have decided to improve its ranking so I have submitted a reinclusion request and gain and again and again.
I have been told that Google were quite good at replying to reinclusion reuests, but not in my case.
However I also read that banned sites have a grey bar in the Page Rank tool bar. My site does not have any grey, it is just white. (it was a PR3 before delisted).
So is my site banned or just not seen as important enough to relist. An automated decison or a manual one?
It is an insurance directory (which I know wont help) but no spam and optimised fairly,so no black hat stuff.
Does the fact I am delisted mean I am banned? Or should I have a grey bar?
Some feedback please.