I used to think that this phenomenon (dealerships being largely incompetent/un-knowledgeable when it comes to their vehicles, ETA's, state of tune...whatever) was restricted to motorcycles...maybe because it's a smaller economy than say, the automotive industry. Alas, just bought a new car and having gone through a long evaluation process, many test drives and many sit-downs, can tell you that very few car/truck dealerships (with no relation to vehicle price) seem to have any idea either. I think it's just the "dealership" model that's broken.
I like to look at it like this:
Dealerships are tools you use, a necessary evil if you will, to gain access to hardware (bikes, cars, parts...). The less you can deal with them and the faster you can cut them out of the equation, the happier your motorcycling days will be.
There are RARE exceptions to this rule ("unicorn dealers") but if you at least go in with this expectation, you'll be way less frustrated.