"People don't act logically"

True statement.

"(even when it's obvious that they SHOULD)."

It may be obvious, but it's only obvious to you, not them. One of the big secrets to persuasion is that people never believe what they're told, but if you can lead them to make a certain conclusion themselves, their belief becomes unshakable.

"Relationships are where it's at."

Most people think of relationships as having two sides, a you and a me. A sales relationship, however, must only have a you (meaning 'them'). Only by taking me and my needs out of the formula, can I lead you to make your conclusion.

"Ultra logic-driven people like me, don't/can't get very far."

True if you stick with logic as a sales technique. Logic indicates that you would make a change.

"It doesn't matter how much of a NO-BRAINER an offer is (logically), it's not gonna sell without the *know you, trust you, like you* formula."

True statement, but you may be missing the how to get there part. I, as a customer, will instantly like you when I perceive that you like me. In other words, when you have taken you out of the formula and have shined your little light on me and my world and my needs, and I perceive that you are sincere in your like for me, then I will like you and trust you and buy from you.

"I keep not being able to learn that lesson."

That statement could be reworded as 'I can't learn that lesson'.
Then it can be reworded as "I won't learn that lesson."
Which begs the question of "Why won't you learn the lesson?"