I hope this quote will give us some insight regarding the growth of the Islamic State and why people are attracted to it.
"We are at a time of Jihad; Jihad for the sake of Allah is
a pleasure, a true pleasure. Mohammed’s followers used to compete to do it. The
reason we are poor now is because we have abandoned jihad. If only we can
conduct a jihadist invasion at least once a year or if possible twice or three
times, then many people on Earth would become Muslims. And if anyone prevents
our dawa or stands in our way, then we must kill them or take as hostage and
confiscate their wealth, women and children. Such battles will fill the pockets
of the Mujahid who can return home with 3 or 4 slaves, 3 or 4 women and 3 or 4
children. This can be a profitable business if you multiply each head by 300 or
400 dirham,. This can be like financial shelter whereby a jihadist, in time of
financial need, can always sell one of these heads (meaning slavery). No one can
make that much money in one deal (from hard work) even if a Muslim goes to the
West to work or do trade. In time of need, that is a good resource for profit."
--Abu Ishak al Huweini