I can certainly see what you're saying (replying to both posts).
The thing that keeps bugging me of course is my size being somewhere in between. I'm large enough that I can certainly have cleavage if I go that route (maybe not pressed against each other but I can still have cleavage), but small/shallow enough that many people (at least men) will likely not take note of what's going on under my shirts (braless, a bra would increase protrusion). That second part will make it harder to justify wearing.
And of course there's the money issue. Whenever I decide to go bra shopping, something comes up and empties my account. Then I have to save all over.