I believe in it because it works. But the intention has to be pure, and you must remember two intentions can collide. Also the language in which to send them isn't in English.
It isn't like "I intend to find a million dollars today".
It's deep in symbols and you have to be within the stream of energy it applies too, OR have enough energy being sent out. I believe it has a lot to do with Chi, but there's a lot to it. As you send out symbols, symbols will be sent back. You will learn how to interperate your life as a dream... Think about the strange coincidences you notice each day, or why randomly you will fall down a set of stairs, or notice the most beatiful flower, but no one else your with would have even seen it without you pointing it out.
I believe ghosts/hauntings are a side-effect of this...Think about it...
I have yet to read your link though so I'll get to that next.
Controlling intentions is a huge step into changing the realm in which you exist in. Which is something I've been playing with for a year or so now. It's dangerous water for the stable mind. With every gift there is a deficit.
I've also noticed, people get what they really ask for in life. look at someone who is miserable, and study them. Chances are they send out intentions of being miserable daily.
"Be careful what you wish for".
I could go on for pages and pages, but I'd hate to bore you people with my schizophrenic beliefs.
P.S. For all you people who ask for vibes(in the vibes thread) I really do my best to send them your way.
Edit again - A week ago or so I was thinking to myself how I wanted a headband to keep my hair out of my face. Then I went for a nice hike last Saturday, randomly took a pit-stop through a clearing to sit-down and drink some water. And I found this little bright blue head-band(it's actually my favorite color blue), just sitting there on the ground. Literally right where I was going to stop. I wear it as a necklace now, I believe it brings me good luck and serves me a good reminder that I can have anything I want.