I don't think it neccessarily applies to just "WAGS" of footballers.
I know a woman who is a very successful professional in her own right. (She's a barrister). She married a man who comes from an extremely wealthy family, with a large house, a ski chalet in Mirabelle, yacht in the Carribean, country retreat in a "naice" part of Oxfordshire, etc, etc.
Her "D"H is a womanising tosser, who is blatant about the fact she is a trophy wife who needs to put-up and shut-up because of his money. On her hen weekend (she was away), the H had prositutes to the house, as well as other sleazy things. It was not the first occasion he'd done something like that when she was away.
She doesn't want to loose the rich trappings of her life style and so she lets him do what he wants. She's now produced a heir (had a DD in August) and so as far as she is concerned "she is set up for life". She considers herself "successful", because she has this rich luxurious life-style with unlimited wealth. However, she never knows if her "D"H is going to be home for the night, who he is with, or who is his current one-night shag.
She "looks down on me" and has told a mutual friend that she can't be friends with me because my DH is not wealthy enough for her social circles. (You can imagine I cry myself to sleep over this
). Yet, with my DH, if we were to loose everything and live in a cardboard box under a bridge, we would still have a solid relationship and adore each other. But, if she lost all her money, she wouldn't even have her DH, because he'd be off to the next conquest.
I know it's a matter of opinion, but I think she's no better than a prostitute, because she's made the decision to stay with this wanker for his money. I think many WAGS are the same.