wealth and/or brawn helps in taking care of women (and offspring), just in different ways. remember, all this is unconcious. we've been doing it for most of recorded human history and probably before before we learned that animals act the same way.
here's an interesting study: they found out by looking at personals that women in big cities like boston and l.a. generally look for wealth while women in rural areas look for emotional connection. emotional connection is advantageous to the woman and offspring--just like brawn or wealth--because it shows a bigger chance that the man will stick around longer to take care of the baby.