I don't understand why such people would wish to run worldcons.

Ego. It's what I call "Event Fandom." If they're going to run a con, it's going to be an 'important' one. A good chunk of those types of folks aren't interested in anything else, and rarely go to other things. And if they do go to them, it's rarely social. It's usually to fly the flag of their event, or to headhunt people.

To them, smaller cons are unimportant. I know of one person who gestured to the successful smaller con around them to their friend, and said loudly, "None of this matters, you're with World Fantasy!" Doesn't matter they were drunk, to me it showed their real attitude to standard conventions.

Personally, I see the smaller cons as the important ones, because they bring new people in and keep things alive between the event cons.

I'm fully behind a Perth bid.