So, my questions are:
1. Has anyone else noticed this in their used car lot?
2. If so, are your E46 M3s (or other cars in my list) Laguna Seca Blue every time, too? Or are they black or red or silver (or some other color) every time?
Yes. And from Famine's Used Car Database thread in the Q&A section I've noticed that my cars and his cars seem to all be in the same colours, even though our used car rotations start with different lists. My M3s are in Lagunaseca Blau as well.
It's a great shame. Some of the GT4 cars had really interesting colour selections (TVRs, some NSXs etc) and I initially avoided certain cars in the hope I'd get them in a better colour. If everyone were to have the same colours available then it wouldn't even be possible to get the others through trading.