I often get the feeling between the cruise lines and travel agencies that they are the mattress store that is "always having a sale.". After a while you start to ignore the "half price", "OBC" (that isn't combinable with any other discount), reduced deposit, one day sale or the other myriad of sales that occur. Most of the time they really aren't much of a sale and you become numb.
It's sad that almost all of the snail mail and email promotions end up in the "trash" either on the computer or in the garage.
Remember: "Act now! Our 4-day sale starts today.". I just added this because I just received this email from NCL.