Dear Zenimax,
rather than wasting developer time constantly adjusting the drop rates of high level motifs - yes we know you do it - I have a suggestion.
Once you reach the veteran levels why not have quests available from the Blacksmiths, Tailors, and Woodworkers who hear tell of rare style books. You would then have to complete the quest in order to acquire the style book for the quest giver, who would then give you a copy upon completion of said quest.
The quest could also be levelled to match your crafting ability so at the appropriate level you could go off and quest for a primal, barbaric, ancient elf or daedric motif and the experience gained from completing the quest could go towards levelling your chosen craft.
This to me would be much more enjoyable than having to open every single container throughout the world in the hope of finding one. It would also help keep the world immersive and fun instead of having to port all over the map while trying to hunt down a particular motif.
Additionally I think it would help reduce the numbers who actively farm motifs in order to sell them at ridiculous prices as everyone would then know that at some point they would be able to get their hands on one. People willing to buy them would still be able to do so, while those of us who just want to get on with our crafting without having to empty the contents of our coinpurse for one motif would be able to do just that.
(EU/AD) CP501 Razum-dah - Khajiiti Templar Healer
(EU/AD) CP501 J'Kara Silverclaw - Khajiiti Dragonknight tank
(EU/AD) CP501 Rajhiin - Khajiiti stamina Nightblade
(EU/AD) CP501 Draven Corvillian - Breton magicka Nightblade
(EU/AD) CP501 Sinderian Nightflame - High Elf magicka sorcerer
(EU/AD) CP501 J'zargo Silverclaw - Khajiit stamina Templar
(EU/AD) CP501 Ariella Nightshade - High Elf Magicka Nightblade
(EU/AD) CP501 Ri'shada - Khajiit Stamina Sorcerer
(EU/AD) LVL29 Valeon Indoril - Dark Elf Magicka Dragonknight
*The Queen stole this one's moonsugar candies lol*