I think one big reason why people don't buy ship games, is because of this comment I once heard:
"Because ships are so slow"
That's why I think SSE is being marketed so much as an action game, to attract those people who want the fast, speedy, action style
I think I remember that review, it was moaning about doing a ferry run with Red Eagle saying how boring it was. Haha, what do you expect on a ferry crossing though? Captain Pugwash to leap on board? I bet some, if not a lot of the parts for their computer they typed that on were transported by ship in that way, so I don't know what they're moaning at