Nice Post OP, you can just edit ur post and add these few rubbish your bout to read.
Pros of Increasing Clan cost.
I think it will make clan owners value their clan more, leaving us with more responsible clan owners because a milli ain't a joke especially if it was paid by a lower level.
That will drastically reduce people passing clan at will or while deceived because they can just open 10 more with a good 3 mins loot, cos you'll know u have to farm a milli to start a new clan.
Cons!
Given that clash if clans is more than 5 means we have enough clan to go round a war spin for all clan sizes, not a new game. But won't that make us lose potential new guys?

