"Does anyone give a shit about your dumb idea?" should be a bumper sticker
I dislike this style of communicating a point. There has been an epidemic of it on the web over the last year or two (that and its close cousin, the "X Reasons Why Your Y Sucks" post). Apart from being crude and overused, I think it sends the wrong microsignals. Many good ideas seem dumb at first. To me it indicates a deep misunderstanding of the creative process to blast anything in the delicate, incipient stage with this kind of harsh language. The most consistently creative people I know don't do it.
This may be a merely stylistic point, a matter of taste, but I suspect it's more. The way one puts things has effects. In particular, it affects what ideas and possibilities open up next.
I actually think it gives exactly the right signals. The people you'll have to sell to (customers, investors, future hires) will probably not be very understanding of the creative process. They'll think your idea is dumb, and they'll say "no thanks," or just hit the back button, without a second thought. The presentation is about convincing them otherwise, so it makes sense to put the problem statement front and center.
The graphic from the homepage of www.ABtest.com is also pretty self-explanatory about A/B.