Let me explain:
Lorewise the Draedra and all the related stuff around them (armors, artifacts, etc...) are extremely rare and often occurs in very special events, but in terms of gameplay, you can usually find a Draedra Heart at the Arcadia Cauldron in Witherun, that kinda break the whole epic and mysterious stuff... and pretty much the same with a lot of items, you never meet a single NPC wearing Ebony stuff in all of Skyrim, which is normal since it's supposed to be rare and for the filthy rich and yet, you can find ebony armors, weapons & ingots in every Blacksmith shop.
For me, it kinda breaks the whole immersion Bethesda was trying to deliver.
Wouldn't t have been better if the shops had a preset set of items instead of just scaling with your level progress? and if one seeked special material then maybe have a special quest to make their inventory upgraded?
What I mean, is that in Fallout New Vegas, you would never see the Gun Runners shops selling energy weapons or Cliff Briscoe selling Powered Armors, there was a certain coherence, a coherence that I can't find in Skyrim.
That was just my 2 cents about it anyway.
