Stickers are the same as badges - I say you don't need 'em.
1. If ppl don't know what you're driving it's their ignorance on display.
2. I don't believe in "free" advertising for any one or any thing - my car is for ME to enjoy - it is not a mobile billboard.
I don't mind the manufacturer's badge, which is their logo and which they are entitled to have on their product. Model badges, engines, transmissions, brakes, diffs, ECUs, are put there to make the elitists (I call them wankers) feel good. I have debadged nearly all vehicles I have ever owned except for the "classics" which should be kept in close to original appearance.
I HATE copies of anything ... including GTs.
Of course all the above is just my opinion - just like arseholes, we all have one. I don't care what anyone else puts on their car - just don't put anything on mine!