What if I forget the vendors for items I used?
What if I don't list them because I got the item elsewhere?
What if I don't credit an artist because an aspect of their item sucks (like the node set up in the mat room) and I have to go through the process of fixing it myself?
What if I decide not to credit a vendor unless I get a piece of the action from any purchases (no free advertisement)?
What if someone likes something they just send a sitemail to the artist asking what they used?

IMO requiring people to post which items they used is a little dubious. 

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)