Yesterday I posted on another board a different option for a breather filter setup than the standard Emgo filter everyone typically recommends on my Ninja. One thing that happened immediately was a couple of people trying to argue that I'm going to get water in my airbox. This despite the fact that I pointed out that I don't ride in the rain, so therefore the only way water was getting in is if I dunked my bike in a lake, they were painfully insistent, going so far as to suggesting better ways of mounting it, including upside down, which would then allow any oil that should collect and drain back into the crank to just drip out on the engine, thus defeating the purpose of the filter.
Now let's take this to the next level. How much of a concern is this, really, for people who ride i nthe rain? I mean, the function of hte breather is to allow pressure to escape from the crank, so by design, water infiltrating should not be an issue. When I had my Vulcan, I zip tied it to the frame on the left side of the bike, theoretically putting it in a position where it could get wet if I rode in the rain.
Personally I think that the 2 guys were just over thinking the issue, in fact creating an issue when didn't really exist. On the bike in question, the breather is tucked deep under the carbs with plastics on each side. For reference, here is the setup.