I don't think there's any comparison. Your unlikely to have spent so much on a flight and certainly not on the plane for 12 nights!
As has been mentioned, if Celebrity said there was an issue with an engine due to maintenance thus reducing speed, personally I would have no issue. If it was something else, I might. Would engine maintenance last several months - possibly as there are several and this is a possible explanation.
Celebrity need to take steps to avoid the speculation.