Because it's kinda like the guys who get 12k HID's because they're purple and wanna be "unique". It's annoying, and pointless, and they're horrid, they kill your light output, and "smoking" everything and "murdering out" cars is (99.9% of the time) ugly and for people who have no style. If you really wanna get something that doesn't come stock as prev. stated, get Ocean tails (not stock on US models) or get some of the M3 styled LED tails (if you can make them work) or something else. With these cars it's clean>obnoxious/ricey/heylookatmei'mcool.