I think the fact is that women's life revolves around presenting, or rather attracting the male counterpart, so intrinsically women are more susceptible to take extra good care of their Avatar ( body). Now, not all do, and this isn't one mold fits all, however as a general rule this is how world revolves.
Now add our point of view on finally being able to be part of such celebration of self, and you get someone who does care to present in utmost perfect way.
Nothing wrong with spending hundreds of dollars on feeling of adequacy, take it further and which girl wouldn't want to look like million bucks, however some even though having such need, simply can not afford such embellishments.
I for one can not afford anything besides good cosmetics, occasional drop dead gorgeous garment, or heels, oh yeah don't even start there, (heels I usually ware 3% of time, lol)
But in a nut shell, living life as a woman presents it self with challenges of aspiring to beauty, poise, and youth, which all do cost quite a bit!