Dual passports and the schagen agreement + NZ bilateral agreement

Here i would like to share my visa stories in the hope that it will help future travellers.

SUMMARY:
-MY Schagen overstay in Greece resulted in a fine (that i dont have to pay unless i go back) of 600euro. i was over for a week and a bit.
-Greece DOES NOT seem to know about the bilateral agreement with NZ allowing 3 more months regardless of schagen. as seen here: http://www.safetravel.govt.nz/destinations/europetips.shtml
-Dual passports are not linked on any computer system
-90 days in bulgaria is from the first entry even if you leave for a few days (as far as the border people are concerned)
-Fines are not gareented when leaving
-IF YOU HAVE DUAL PASSPORTS then the 90/180 issue can be worked around for continous stay (with border runs each 90 days)

1. Schagen Overstay + NZ Bilateral Agreement
Right, so i have taken a lot from this forum and it has been very helpful, its time to give smething back.
I am a New Zealand Citizen with dual citizen ship with USA. This means i have 2 passports.

--I flew into spain on the 12 of july 2011 and had my NZ passport stamped. This was the start of the 90 days in schagen.

From there i traveled around western europe (spain, germany, czech, france, belguim, neatherlands and austria) no problems there, they are all schagen countrys. I traveled via train, bus, hitching and flights and never had my passport checked (as expected)

--On the 10th of october i flew into greece (also schagen). I knew that i only had 2 days in greece before my 90 schagen days were up. I was not worried because i had read online (NZ govt site http://www.safetravel.govt.nz/destinations/europetips.shtml) that NZ had a bilateral visa waver agreement with greece that allows another 3 months regardless of my 90 day schangen stamp time.

--I left for bulgaria (via plane) on the 21st of october. At the border control the guy had a good long look at my NZ passport. He then got out his calculator and decided that i had overstaied. He then swiped my passport throught the reader and this confermed his math. I was taken to a room where a a (very attractive) greek border lady imformed me that i could only stay in the schengen area for 90 days. I was expecting all this and had printed out the information on bilateral visa agreement from the internet. Se looked over this and again told me that i had exceted my 90 days. I tried and tried again to tell her that NZer's have a special agreement (that is not always known). She then asked me if i though that she didnt know her job. At this point i relised it was usless.
She wrote me out a fine for 600 euros. i told here i had no money to pay it. She said that next time i come into greece i wil have to pay it. but i will just enter on my USA passport wont I :)

2. Dual passports:

So me and my friend entered bulgaria on the 21st of oct, me on my USA passport and he on his NZ.
On the 29th we left for istanbul.
On the 3 of November we re-entered bulgaria. This time i entered on my NZ. My friend was still on his NZ.
We both found jobs in Bansko, Bulgaria and lived and work (illegally) quite happly. A week before our 3 months were up we decied to try to extend our visas. This was not possible because we dont atualy have visas (we just have stamps).
The imigration offical told us that we would have to leave within the week. He then copied our passports and told us that he would follow this up to make sure we had left.

After much deleiberation we decied to stay anyway. on the 24 of jan (93 days after our first entry into bulgaria our american friend got a phonecall from the imigration officals to see if we had left the country or not. This was ovously a serous immagration officer if he had tracked down our friends number!
He threatened us with a total EU ban if we didnt leave in 2 days. He also said that we would get a fine on the border. Im not sure if the ban is even posible but we didnt want to take chances so we left on the 25th of jan to serbia via a bus.
At the border i had no problems. I relise that this is because on my NZ passport it looked like i had stayed less than 90 days.
My friend who had stayed 94 days (from first entry) was taken into a room an asked questions. He protested that he had been to turkey for 4 days so realy it was only 90 days and he was fine. This did not seem to matter for the border officals.
The border officals were manly surprised that someone would want to stay in bulgaria for more than 90 days and in the end they let him go with no fine.
So the zealous immigration officer did not mark our passorts... and we both got out fine free.

3. RE-ENTRY
I reentered bulgaria 2 days later on my US passort with no hastles at all. I was quite suprised because on my US passport i enter serbia 2 days before from bulgaria with NO bulgarian stamps in my US passport. In terms of my US passport it looks as if i left for turkey, dissapeared of the system and then sudendly reappered at the serbia border. I expected problems with this, but no.
So it is clear that my passports are not linked (at least in the bulgarian computer system). I guess it is fesable to have an american and a NZer born on the same day with the same name?
My mate is not so lucky to have dual passports. He went to asia.