I've never encountered any of my stash deteriorating, either. Like some others have mentioned, I've recently decided to start working through my stash before stocking up any more, mostly CCs & SCs. I manage to work through my RTMs quicker because I use them as my after-shower all over body spray, not just for my hair. A note for some of you who like fun-fragranced shower gels...use your seasonals as BCCs. In my opinion they work just as nicely as the "real" BCCs, especially the lighter weight ones like SOB, CLV, FTP.
Time is just a drop in the bucket compared to eternity. It isn’t how long you live that matters; it is how well you are prepared to die. ~~Colonel Robert B. Thieme, Jr.