I suspect it has more to do with the increased price of corn and grains. Which has been slowly going up over the last few years. Blue Seal is or was a top of the line feed. They do know what they are doingI was told that because of the drought, some feeds did not have the content they normally have. If the milling doesn't take that into account, the quality of the feed could be lower than last/preivious years. This probably is not as much of a concern for brand name feeds.
Framac