I agree that some women do seem to want to hurt the man via his finances. If women only got what they 'needed' then many would get a very small proportion of their husband's money - look at Heather Mills, sure she didn't need millions, the rest of us don't seem to....
In actual fact, if they are going through the court, the financial settlement is totally separate to any 'reason' for the split - so he could have shagged her pet donkey and it wouldn't mean he paid more. The reason for divorce is only there as a way to terminate the contract, and there are various ways to do that in law - adultery being one, unreasonable behaviour, split for two years etc. Sometimes one person agrees to have adultery put down for them even if they haven't done it so they can be sure the petition will be granted (though, frankly, judges are not really in the business of trying to keep unhappy couples together).
Financial settlements, maintenance, consent orders, alimony, spousal maintenance, clean break settlements etc are all separate to the actual divorce.
I agree that you cannot see this objectively from where you stand. I met a guy who was separated and going through divorce - not specially acrimonious, not really dragged out or anything - and I refused to have any financial link until the full divorce was through. Not that he was trying to make me have or pressurise me or anything like that, but there was no way I would even move in with him until the full divorce was sorted.
I know all the details of his divorce settlement because I have seen the documents. It's important to me to know about this as I needed to know what his financial future was , for example, if there was any chance she could come back and claim more (no) or claim his pension (no), because once we'd bought a house together I needed to know what our future might look like. But I am very financially minded so I wouldn't go into any relationship without lots of understanding about the money side.