No devaluation. For a couple of years now AA has been using very dynamic pricing for award tickets on their own metal. You search award space and the number of miles required may be different every time you login. It may go up or it may go down depending upon who is booking tickets and what their revenue management system decides when they run their algorithms. The lesson is that if you see something you like grab it, and keep looking. Right now you can cancel and rebook at no charge.

For BA flights they are always priced at the Saver but you have to pay the very high BA surcharges,