They certainly aren't businesswomen. They've been getting pimped by their manager or their parents or SOMEBODY since they were the babies on Full House. I doubt they make the majority of the decisions that have made them so much money.
At some point along the line you just realize that they have completely become their marketed persona. They don't have personalities aside from what the media sells them as. Have you ever read an interview with these girls? If so, you'd see what I mean.