I'm not going to defend the LSC. And I'm willing the bet that LSC staff aren't going to respond to ALL of you requests. Your's is not the first post of skepticism I've seen.
Why don't people get the systems right-away? If I knew that, and how to teach them how to get it quickly then I'd won't need the prosperity tape. I have some idea why, and they are in the threads throughout the forum.
Does it work. I believe it does. The word believe is readily interpreted to mean that I don't have it working to my expectations (yet).
I will say that I have read books that would have taken me 20 to 30 hours in about an hour or two. Now my recall is not as good as if I had spent 20 to 30 hours. However, for these books I feel I have all the information that the books have to offer me.
My advice to anyone that is skeptical is by the book. Since I suspect, as you've noted, that most people who don't get the systems to work for them don't put enough effort into them. This way if you are going to put the effort into it, then the little extra effort of reading the book as opposed to listening to the tapes is trivial. If you aren't going to put the effort into it then you've waste a much smaller amount of money.
Why do the systems cost so much? Well they are running a business, and they have their own needs and goals. I've never heard anyone say that all the people at LSC are independently wealthy and altruistic. I've also not (well hardly ever) heard LSC accused of beind dumb. These people understand business, and if they felt they could sell enough of the system for less (and probably make more money) then they word.
I know this isn't satisfying, but well I doubt there is an answer that will satisfy you. It's not you personally, it's just the nature of the problem.
Oh where's Michael, he'd have a good quote at the tip of his tongue. How's this. The universe rewards action with a reaction. Okay too cryptic. More Michael like... the fullness of life is experienced in the adventure of meeting challenge, and without challenge life is dull (see Beyond Human forum for a better version).