The principles of attraction are all 100% known. Just follow them and you will get girls.
Stop whining and stop making things complicated. Do what works. It's like you guys are looking for reasons to fail. Your mind is your own worst enemy.
The fundamental reason you cannot get girls is because you cannot even walk up to a girl, look her square in the eyes, and hold a normal conversation. Stop blaming spirituality for this or "being a nice guy". You just suck at the fundamentals.

Except you are hardwired to crave and need sex. And if you fail to get it you will become dysfunctional.

Pickup has an insanely steep learning curve. You have to be irrationally optimistic to succeed. Any doubt, negativity, or weakness in your attitude will fuck you up.
Same as business.

That's a good question.
I'm basically very realistic and pragmatic about how the life works, especially in the short-term. But I'm very optimistic about my potential and what I can achieve through consistent labor. So, for example, I will admit that I suck with girls when I start. But I am very hopeful that I can become very good with girls after 5 years of constant practice. That is  not bullshit, that is truth. You can master most areas of life with 5-10 years of deep practice.
Basically, the way to keep yourself hopeful is to understand that if you want something bad enough, you can build it with hard work within 5-10 years. So there's no reason to feel like a victim.