I am surprised because I have seen this question discussed many times in Miles&More (Lufthansa) thread and everybody was always laughing. In my mind, they were right, because IMHO this would be absolutely contra productive.

As an example: We have half full C class cabin. We want to fill it up, so we come up with special, to attract more people. What if we do not attract more people and lose some of the revenue that we have already earned on this refare?

On the other hand, we MUST incease price, let's say because of fuel cost. Is it than fair that newly booking paxs must pay more than those who jumped early and predicted the cost rises?

Still, it seems weird to me...