The one and only difference is the size of the cheque book.
well no not really
That spoiler is a replica of the one used on the M3 GT2 i posted above.
The guy is apparently planning to take it to roughly 40 track days a year.
Given that it obviously serves a purpose (otherwise bmw wouldnt use it on their GT2 race car) and he's put it on because he intends to use it on the track its not a pointless chav mod.
You can argue as to whether you like the look or not, but one thing its not is chav.