Not really that strange when you look at it - let's face it, the old M types even though impressive when delivered do not really fit into the Maersk schedule nowadays (this is why Maersk released them on time charter to MSC), and are 20 years old - instead of flogging them off to a Greek or German tramp owner who may have paid 75-80% of the market value of the vessels, MSC have probably paid a very reasonable price for the vessels to secure them. At the end of the day, if Maersk sold these to tramp owners, I'm sure the intelligent management at Maersk would realise that these would fall into the hands of their prime competitors on time charter so why not take full potential and sell them to them to a main competior and get the best possible price - let's face it, with Maersk's profits, it's just a small drop in the ocean with 18,000 TEU's on their way!