Cammy, I don't know if there's anything to it, but I just looked at your products and my first response was 'Oh these are nice!' followed by 'but they won't work for Maitreya'.
Looking at your timescale, is it possible that the drop was about the time Maitreya came out, and perhaps, since, many potential customers are lured to sellers that cater for that body too? Just a thought.
*favourites one to keep an eye out in case you DO indeed add Maitreya*