According to the auto industry
Approximately 5.1% of cars are scrapped each year. Let's round this to 5% to make it easier. Rounded to 5%, this works out to about 40% of the vehicles have been lost by the 10 year mark. By the 20 year mark, you are down 60% of all produced.
Given a total worldwide production of 130k e30's and a period of 20 years.
By year 10, we are down to 80k
By year 20 we are down to about 50k
So the question is, how many made it to the U.S. and how many were M42 e30's.
In 90 and 91, only 60,500 e30's were imported according to StrictlyEta.
Lets assume half (30,000) are of the m42 variety.
By year 10 we have lost 12,000, Leaving just 18,000.
By Year 20 we have lost 18,000, leaving just 12,000.
Remember, I rounded DOWN the number scrapped, so those numbers are HIGH. It is probably closer to 11k. Divide that amongst the models and you get a pretty rare car. And we wonder why there is little for these cars.
Interesting note, every 325 model had more produced than the entire e30 m42 range.