I have never understood the whole "stuff a big engine in a bike" thing. The engines are never very powerful and the bikes are always heavy as shit. These bikes, without exception, end up as styling exercises (with mixed results as you pointed out) that are dynamically challenged.
So they are built for people that want the biggest engine but don't actually ride, and the world is full of those people. It's probably a lucrative market.
Not that I have the high ground on the whole "not riding" thing.