Bying a share in a ship is under investigation. I am getting prices and finding places where such things happen, see the thread on cruisers forum.
In a danish magazine for cruisers, I stumbled upon a share for sale in Grappen.dk. Tempting. Interesting, thought provoking - how serious is this dream, how would it fit with the rest of the dreams pursued...
 

If I pursue that possiblity, expect to get update here :)