Tape, decals, perceived status (usually imagined)....what you'll be judged on is your output.
However a valid reason to tape up is when you want to "dress-down" for those occasions you are shooting in high crime areas, low security areas or countries where invisibility is helpful for security or minimizing the attention that you attract to yourself.
A 5DII without the grip, but looking like it's so clapped out it's held together with tape will be unseen by a street thief who might snitch it off your shoulder. Junk has little resale value. A great photo's value can be sky high.