Interesting observation! But like stated above, the E30 was the first M3 so it had a lot of historical value, and E46 M3 was when people were boomed with money thats why it is popular also. I am sure the E92 will carry on the E46 popularity and will not be forgotten.
1. E90 325i/328i/330i Eisenmann Race Exhaust 2 x 76mm (Used for 30000 miles) $680 OBO
2. BMW M3 Steering wheel $430 OBO
3. BMW Original E90 Blacklines $230 OBO
4. BMS Powerbox $230 OBO