I have given up understanding LOST. I am just waiting for the train wreck ending! So far from my previous list of questions that I posted only one out of the 25 were answered.
My first mate and crew are napping and I had a chance to look; is this the one, because I thought I'd take a crack at your questions...?
http://www.therpf.com/showpost.php?p=1181784&postcount=373
If the one that was answered was the significance of the numbers (the list of Jacob's candidates and their "jersey numbers"), the only one I think I would even attempt was the third one, about folks being brought there through tragic events, and, even then, I could only point out all the times people showed up of their own volition (Like Juliet and all the Dharma cats), or through some happenstance (like the original
Black Rock crew or Desmond on the Elizabeth).
If I was feeling feisty, I might attempt an answer to your second one, about why people are drawn to the Island, but I'm not, really.

I think they've answered that one pretty clearly already; that Jacob keeps pulling folks in to prove some point about human nature to the Man in Black. Now why
Jacob is doing that, I couldn't guess, and I hope they do explain, before the end. There's a Jacob-centric episode coming up, and I have a feeling that one will blow the lid off some things. Or, at least, shine a light in some of the dark corners they've built for themselves.