Heya,
I've seen shadow claws. I used to do it to prebuff venom and to get a higher Shadow too, and/or Fade in HC untwinked.
I still like to shop with my highest level. The possibility to get the higher level mods and still get the +3 is gravy to me. Plus, when I shop, I look at everything because sometimes you notice that perfect godly archon plate of the whale, or perfect mechanics archon of the whale or balance, etc. Things that most people "lol" at since they're not forts or nigmas. But they're still fantastic for folk who want things like 60% ias armor, or %ED armor based on jewels, or just MF armor in general, with other mods and still good DEF.
Cheers,