The Laws Of Attraction (LOA) make sense to me in this way: if you think you're a failure, you will lack motivation to do the next step that will lead you to success. If you have a bad attitude and see yourself as a victim, you will communicate that to others and they will be less inclined to interact with you favorably. The guy who thinks he's unattractive and will never get a date will (guess what) never get a date because he will have a really hard time presenting himself as a desirable and interesting person. Simple.
All the "metaphysical" trappings that New Age writers pile on these LOA are, I believe, completely unnecessary. In my opinion, there's no real Secret in the LOA, and nothing mystical or quantum physical going on ... just ordinary human psychology. Note that I'm not saying there's no value here, just that attributing the success of the LOA to something metaphysical sells New Age books & movies and is exciting, but is not necessary to explain why they work (see paragraph one). This Wikipedia article talks about The Secret and provides links to some of its critics:
The Secret (2006 film - Wikipedia, the free encyclopedia)
In the words attributed to William of Occam, "entities should not be multiplied beyond necessity". In more modern terms, KISS:
KISS principle - Wikipedia, the free encyclopedia
Vasily