I said something about this earlier in another post,
"I wonder if in fact this was the primary objective with the act of terrorism a guise just so they can profit. Think about it, if Allah is so great and and life after death means so much, why aren't the people at the top the first to go? I think the whole thing is a scam that has been going on for generations, raising these people from a very young age to do the dirty work, making a fortune, all in the name of Allah. I think that bin laden answers to older extremists that are running the show behind the scences, and the heiarchy extends well below the surface.
BTW, this brings up another question. It has been said that only bin laden had the resources to accomplish this act.
But in reality, how much money came out of their pockets? They used our planes and fuel to attack us. The building themselves were used as weapons of mass destruction. We might ourselves unknowingly have even contributed to training these animals.
All in all, they got out pretty damn cheap, with their biggest expense the loss of their hi-jackers and we know how much human life means to them. Especially if you look at the risk versus reward. It was a low risk, high gain return on their investment.
Just remember, just because they are the lowest forms of life walking the earth doesn't mean they are not smart, clever and don't want riches"