Huh. Lots of anger at depressed low-self-esteem guys in this here thread. Nice.
There sure are plenty of men who would take this sort of courses with just the intent posted by some here - manipiulate women into having sex, trying to "play a game", etc etc. And the ones offering these lessons are, obviously, ripping those - and others - off. Have you seen those prices?! Hell.
That doesn't mean that anyone who turns to this sort of things necessarily has this view, though. As Gave states in his follow-up...Plenty of guys with anxiety about.
And while I'm all in favour of equality and what have you, fact remains women ARE ten times the manipulators men are, in general, simply because men are more easily manipulated by their sexual blahblahblah. Ecce Homo, and all that - completely explainable through evolutionary psychology. This doesn't make women evil, men weak, or this a self-evident and universal thruth; it does make it a statistically sound fact in human relationships.
I've seen and known too many guys who really are assholes and don't even look that good, walk away with the nice girls (who, of course, feel bad afterwards, etc etc, enter the "bad boy"and "nice guy" syndromes, and so on). Having "game" is important. Knowing how to control your body language; learning a bit about hwo to interact and how to give the right impression - like Steinman said, this is pretty similar to all communication. Debating techniques, dating techniques, they basically come down to the same type of stuff, just differently implemented.
I know I have 0 control over my body language, I'm a nervous wreck, and it shows, and I have pretty low self-esteem, and it shows - and that this is (at least in part) why I can't convince the nice girls to go out with me. (not meant this post to be a baw, dammit. Oh well :-p).
Anyway, while these lessons are probably scum giving crappy "tips" to saps for a lot of money, I fail to see how it'd be wrong for a guy like me to try and find ways to better be able to communicate with women, or how to improve their chances. *shrug*