Yeah, georges80 and robrenz you are right. Surely I am that kind of animal, proudly insane about cleaness. You should watch me cleaning everything for hours when I buy a used puppy on ebay. At the end I am so happy to see how beautiful the device is, I never think I am wasting time to protect/clean my gear.
Some people clean their cars just inside and outside, some people clean also the engine compartment on a regular base. Does the car run also with a dirty engine compartment? Probably yes. Do you feel the difference between a clean and a dirty engine compartment? Probably not. As soon you are stepping in the personal taste field there is not right or wrong, it is what it is.
A big thanks to everybody for the discussion, I´m loving it! Next step I will buy something and put a review here.