Take the cash while you are young and then worry about the awards when you get old and nobody wants to pay you that much to be in the movies. Sadly age is harder on women in Hollywood than most men so they better soak up what they can while they can.
Plus Jolie even stated that the amount of money she makes is outrageous but it gives her an ability that almost no other career could do and that is use a lot of the money to help kids in Africa, which is a factor she uses when choosing roles a lot of the times. Now some people suspect is more of a PR move than anything, but I myself am not sure.