Looks perfect for trapping moisture and heat inside the body...
If manufacturers meant them to have fat rubber covers, they'd make them with fat rubber covers.
Electronic equipment needs to 'breathe' otherwise condensation and/or heat builds up inside the casing.
If you really think you're being brutal enough with your kit to warrant its use, by all means go ahead, but I'd suggect not thinking of it as a permanent fixture - put it on when needed, then take it off again.
However, if you're just being precious about the camera's paint: don't be such a wuss - get out there and get it dirty...