On the other hand most other goods are much cheaper in the US than in Europe and also US consumers also have more disposable income than Europeans making the price difference of a BMW negligible.

And anyway, complaining that some luxury cars are a bit more expensive somewhere is a first world problem most people aren't lucky enough to have.

My point wasn't about purchasing power in general but about BMWs in particular (European cars actually) being a better deal in Europe than in USA. The same way American cars are a much better deal in USA: A BMW 230i with M package is about 13200 USD than a mustang fastback with the 2.3 engine according to BMW and Ford websites using a sillicon valley zip code. My BMW 230i was around 2000EUR (2250 USD) cheaper than the mustang in Spain, and I added around 2k€ worth of extras (not including the m package which I was already counting).

Regarding the cost of the goods, cars in particular are still cheaper in USA (even European ones). Most American states will have cheaper taxes than most European countries.

Regarding the rest of the goods, I don't know America nearly enough to have a strong opinion, but checking median salaries by state and median salaries by country in the European union I'm quite skeptical to believe most goods are actually cheaper.

Regarding the purchasing power I don't know either.

How many BMW drivers care about rear wheel drive? That is a very small niche. People who really want those features would go for one of the more practical sports cars.

This probably varies a lot per region, here in Europe BMWs are a pretty affordable when compared to other real wheel drive cars.

As I said in another comment imported American cars aren't a good deal in Europe. Japanese are a good deal too, but there aren't really many options that are sporty AND practical.