They smell suspiciously of 'I want to do a mod, any mod, itching, got only pennies to spend, will do anything' And unfortunately they tend to get used in any way other than their intended design - left permanently on the car picking up dirt between itself and the paintwork, doing damage.
Rather than using it as an unquestionably ugly but effective temporary means of protecting A1 paint on genuine prize-winners for the few hundred miles they pick up in their lifetime when they actually see any time on the road between shows or work (as mentioned above).
Bad because they're ugly, even worse when they're used as a sceney mod that stays on the car sat still at a show.
Silly.