And about your point of WW2 no one would recreate that or the Concordia so why this?
Well, you don't have to recreate a whole war to make money out of it though.
There are warmovies, TV series, documentaries, museums, museum parks at actual battles sites, hundreds of thousands of books, websites, even more movies, replica's of all types of weapons and/or vehicles, people collect and trade real and replica equipment and such, did I mention they made lots of movies? ...they have parades, re-enactments, you can book whole trips to travel past some of the important battlefields with guides and plenty of opportunity to bring back souvenirs... etc etc etc etc.. you name it.. and every single one of those things makes someone (sometimes a lot of) money somewhere, the same way a replica of an old ship and replicating some old voyage might.
No difference there apart from that one thing is just one boring old ship and the other thing has many many more aspects to it even. But in both cases lots (and in the case of WWII enormous ammounts) of people died, and now we 'experience the past' in some fashion and pay for it in some way or another.
So much money is being made with things related to WWII, that you simply can't disregards that point. And Costa Concordia might well be treated the same way as Titanic is now, had she sunk 100 years ago as a first big tragedy in a long time and/or had a lot more people died on her, but it's too 'new' and not 'important' enough in this day and age, to leave a similar impact. As tragic as it was, there are other tragic things going on every day.
Fred.