iGaming Business – Greek gambling monopoly OPAP has cited the introduction of a new gross gaming revenue tax in the country as the reason behind a significant drop in net profit during the 12 months to December 31, 2013. The new 30% tax on gross gaming revenue for companies in Greece meant OPAP’s net profit totalled just €141.1 million ($194.7 million) in 2013, a 72.1% drop on the €505.5 million achieved in the previous year. Full-year revenue also fell 6.6% from €4 billion in 2012 to €3.7 billion in the last 12 months, while gross gaming revenue dropped 6.3% to €1.2…