According to sources in Gaza, Haniyeh's wealth, like others high up in Hamas, came primarily from the flourishing tunnel industry. Senior Hamas figures, Haniyeh included, would levy 20 percent taxation on all of the trade passing through the tunnels.
The Egyptian street has become inflamed with anger directed against Hamas over the last three years, partly due to what appears to be its financial gains at the expense of the Egyptian people. The tunnels in Rafah saw a flourishing fuel-smuggling industry from Sinai. The fuel subsidized by the Egyptian government was entering Gaza at a low price, but being sold for eight times that. Those who made the greatest profits from the sale of the fuel were Hamas members, even as Egypt often reported shortages for its own people.
The political leader Khaled Mashal is another member of the organization who used Hamas funds to his own ends. In 2012, a Jordanian website reported that Mashal had control of a massive $2.6 billion, in large part deposited in Qatari and Egyptian banks. This is likely Hamas' accumulated assets from years through donations, as well as its investments in various projects in the Arab and Muslim world. It is also known that, among other things, Hamas has invested in real estate projects in Saudi Arabia, Syria and Dubai. And, according to reports, Mashal did not always separate Hamas money and his own.
Here's more. Cool people, the Hamas leaders, aren't they?