Other brands tend to lean towards the luxury side, while BMW tends to lean more towards the performance side, even with non-M models. Those interested in luxury cars are far less likely to modify their cars. If you're into performance/driving dynamics, you're likely into the aftermarket, which breeds discussion on forums. Finally, BMWs at least up to this point are just cheap enough where owners are willing to modify them. I don't have any data to back this up, but I would bet the higher the MSRP, the least likely to modify, thus the least likely to get involved in discussions about tinkering with the car.
Again this is just my conjecture.
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