@98PaceCar
With big box Amigas (at least with A3000 and A4000, not sure about A2000) there is an internal jumper for PAL/NTSC which you are referring to, which was used to determine 50 or 60 Hz for display. You see, these Amigas do not have built-in TV tuners like A500/A600/A1200 (well, A500 either doesn't either but it falls into this category anyways) and as such they were never made with specific NTSC or PAL chipsets for those tuners but were shipped as one type all over the world and they only requred the flip of the jumper from PAL or NTSC depending on territory, and of course an appropriate 110v or 220v PSU in their cases.
@Kronos
My nick is stupid? Perhaps. I changed it many times after using normal nicknames just to find out that there were like a million other people using it, so random numbers and letter should do this time. ;-)
As for your other point, well NTSC countries actually have the problem more so than PAL as like I've said majority of stuff is PAL specific and as PAL comes with higher resolution that NTSC, you will run into trouble running PAL games on NTSC Amigas as your display will miss the bottom of the screen and play the game faster than it should. What was coded for 25FPS/50Hz will now become 30FPS/60Hz and that WILL let you probably play the game, but will it play (gameplay wise) as it was indended by the developers? Hell no.
You being in Germany simply never had a reason to deal with PAL stuff on NTSC machines and I doubt that you ever ran into an NTSC specific coded game (name one, I'm not sure it even exists on Amiga that does not have a PAL coded equivalent).
Now, what you are saying about running NTSC coded game on PAL machine is true in a sense that you will get a black bottom part, but the 30FPS/60hz intended game will slow down to 25FPS/50hz. It will run, but not the way coders intended it to. Gameplay will be affected.