I don't know about the Motley Fool, but I feel uneasy about investing in Greek companies at this time given the current financial turmoil surrounding Greek sovereign debt.
(NM and TNP are Greek shipper also...)
I wonder if non-Greek shippers might benefit from any disruptions to the Greek shipping firms (due to striking labor unions, or the unavailability of financing due to another banking crisis, for example.)
The only connection between 'Greek' shipping companies and Greece is that management people are of Greek origin and they personally live in Greece. Companies are not registered in Greece, e.g. DSX is registered on Marshall Islands, i.e. they (companies) don't pay Greek taxes, don't get financing in Greece, don't have relations with Greek unions, etc.