I think that most normal women would agree with you, and me, that we dress this way because we like how we look, primarily it's for us, because we wouldn't do it if we didn't like what we saw in the mirror. I also think that it makes sense for females to have evolved to enjoy looking sexy, and to enjoy being able to get male attention, that would help ensure more people mate. So it's totally possible that women truly do dress sexily for themselves, it's only our DNA that's actually trying to attract mates. There's evidence that ovulating women do dress in more revealing outfits and act more overtly sexual, whether they realize it or not.
I also think it doesn't matter whether it's a conscious or unconscious desire for attention or just a woman's way of expressing herself, we have to agree that men will look, and that some men who were raised wrong will stare like *******. And yeah, I'm self aware enough that I do love when I catch a guy glancing, but smart guys look away quickly. I'm also self sufficient enough to hate when a guy is obviously staring, or when a guy is talking to your tatas. At the least, have the good sense to apologize, admit you were staring like a perv, and give me a sheepish rather than sharkish grin.
So yeah, I'm wearing this low cut dress first for myself, but also because I like other people to appreciate my boobs. Maybe nature drives me to show off my boobs at times, maybe I just like my cleavage because it's pretty awesome. But even if it's my DNA that causes me to wear skimpier dresses in an unconscious mating display, that still doesn't mean that everyone in the room is a potential mate, I do not want every single male's attention.
So for those that like boob watching, please keep it respectful. It doesn't take much effort to look at a woman's face when she's talking to you, and at her boobs in discreet glances when she's not. Respectful boob glancing is more likely to lead to more boob viewing than creepy drooling stares are. And just because she's dressed like a mega-slut doesn't mean she wants you to stare at her like she's a stripper.