It seems to me that if Oceania Marina is going to target any cruise line it will be Crystal.
Crystal also features large ships for a luxury product, and unlike other lux lines Crystal does not include liquor or gratuities in the basic cruise fare.
Now granted - Crystal gas been offering spectacular incentives lately that make it far more "inclusive" - but intrinsically - without the sales special offers - there is little difference between what Marina and Crystal offer.
Do you see Crystal people switching over to Marina? Or do you think Crystal's cruisers are just plain dedicated and wouldn't think of switiching?
(I suspect the latter, but I think some of them may try Marina).