It's always going to happen.
The older model reduces in value to the point it becomes a 'rude boy' car because said 'rude boy' can now afford it. Rather than buy an M5 or a 550 or something, he can only afford a pre-lci 520d SE. But that doesn't matter because he's just going to ruin it with a shite body kit and an M5 badge anyway.
MY14 Space Grey F11 530d M-Sport