Marzook is considered one of Hamas's wealthiest billionaires. "Arab sources estimate his wealth at $2-3 billion," 

Another Hamas leader-turned-tycoon is Khaled Mashaal. "Estimates around the world are that Mashaal is currently worth $2.6 billion, but the numbers mentioned by the Arab commentators (based on their many sources) are much higher, varying from $2-5 billion invested in Egyptian and Persian Gulf banks, and some in real estate projects in the Persian Gulf countries," Elad adds.

The next tycoon on the list is Hamas Prime Minister Ismail Haniyeh. "He is a scion of a family from the Al-Shati refugee camp, and his capital is estimated at $4 million," Elad says, adding, "He registered most of his assets in the Gaza Strip in the name of his son-in-law, Nabil, and in the name of a dozen of his sons and daughters and a few less well known Hamas leaders. They all have homes in good neighborhoods in the Gaza Strip, where the value of every home is at least $1 million."

According to the Asharq Al-Awsat (Middle East) newspaper, one of the most prestigious in the Arab world, recently reported that at least 600 millionaires were living in the Gaza Strip - the same people sitting on the money pipelines there.