Really interesting, AlphaMo. For the main question of causality, I think cause -> effect can be more of a two-way street than is usually recognized. Instead of cause -> effect, it's more like effect <-> effect.
For example it's obvious that mental happiness influences smiling and standing straight. They have done studies that establish that smiling and standing straight also influences happiness and mental state. The link is a two-way street.
It so happens that I'm reading a book right now (The Black Swan) on uncertainty and epistemology (also bored-out-of-town-while-visiting-the-family) and one of the themes is that in the face of uncertainty (about either the future or the past), the cause-effect link is very tenuous. And humans are chronically bad at ascribing cause-effect relationships when there is nothing more than an association. Associations are important, but people wrongly identify causality all the time. Causality needs to be taken with a certain amount of skepticism.
In regard to pickup, there's the phenomenon of backwards-rationalization. She likes you, and believes she likes you [i]because[/i] you're tall or funny (for example), when in fact she likes you [i]first[/i] and then finds an explanation. Obviously, her liking you could never cause you to be tall, but it could very easily cause her to find you funnier.
I'd say your observation is right on. Things can be definitively related, but the direction of the causality is not apparent, or is even bidirectional.
The other part of what you're writing about I'd say is framing, where you project your belief, and she buys into it, or at least plays along because she wants to. There is a lot to be said on this topic so I'll just say I agree with BR, and also Smirks, that value is primary. And value should be understood broadly, including (for example) fun to talk to for now, not just money, power, etc.
