Palermo, May 30 - Italian mafia organizations raked in 25.7 billion euros in 2011, equivalent to 1.7% of Italy's gross domestic product (GDP), according to a study financed by the Italian interior ministry released on Thursday. Out of the total, some 10.6 billion euros went directly into the pockets of criminals, or 0.7% of the GDP, reports the study entitled, "What assets, which mafias, for what purpose?" conducted by the Interuniversity Transcrime Centre at the Universita' Cattolica in Palermo, Sicily, and funded by the interior ministry's southern Italian security programme PON Sicurezza. The Camorra mafia, based in and around Naples and Caserta, took in the biggest haul - an estimated 3.75 billion euros in 2011. Calabria's 'Ndrangheta was next, making 3.491 billion euros, while Sicily's Cosa Nostra saw 1.874 billion. Extortion proved the mafias' most lucrative activity, accounting for 44% of the loot. The study pointed out that mafia dons are more interested in territory and status items than entrepreneurship when it comes to reinvesting their ill-gotten gains. An estimated 52.3% of their dirty money goes into real estate like homes and land, with an eye on zones they control regardless of commercial worth. Mobsters also buy cars and boats. Only 9% of their cash goes into businesses - mainly in southern Italy, but also in northern cities in the Lombardy region, like Milan, Brescia, Lecco and Como. Mobsters gravitate to low profit, low tech businesses, primarily infiltrating the construction, mining and restaurant sectors.