...and we come full circle to:

It's their goal, not their means of deriving methods to achieve their goal, that I would be tempted to take issue with if I tried to engage with the topic.

If your goal is to get sex and that's all, the ethical choices are to explicitly advertise this goal and find someone who shares it, or to take the solo route. As I said, I'm not offering practical advice for the morally indiscriminate pickup artist. I'm talking about ethics.