The weight thing obviously wasn't my main point, its just an added irony of stuff like this. None of those other things you mention are imitation performance oriented parts.
Visual changes and personalization modifications are fine. I've just always thought that modifications done with sole the intention of looking like a cool performance part (like these carbon fiber wrapped things) are lame.
There's a guy here in San Diego that will wrap anything in carbon fiber for you (tanks, fenders, fairings, car parts, mail boxes, flag poles etc..) Yes, you take your parts there, and he simply wraps them in carbon fiber (real are not I don't know) to give you the "look" of a real performance part. You should see all the Honda Civics over there getting carbon fiber wrapped doors, fenders and hoods! My neighbor had his stock pipes on his GSXR done last month...
I put mods like this in the same boat as those stainless steel braided dress up kits that you put over the stock rubber brake, radiator and clutch lines, "Ducati Performance" stickers on bone stock bikes with no DP parts. (or the obligatory "M" badge on a non M BMW), Marchesini Forged stickers on the stock cast wheels, fake blow of valve sound emulators on cars/bikes, fake turbo inter-coolers in the bumpers of a cars, the list goes on....
I'll never rag on someone who paints their vehicle some crazy color(s) and/or does anything to it that makes it their own (in-fact I encourage it), but fake or imitation performance parts are weak no matter how you slice it!
Basically its anything that you can find at Pep Boys (which by the way now sells a 12" x 24" "carbon fiber" sticker for $12.00 for you to get that "look" at home on anything you want! I'd say 2 should cover your Monster tank, maybe 3 or 4 for an OEM Brembro 3 spoke wheel...