Meh, I think this is more about exclusitivity deals than anything. The dress the OP mentioned was a new product, it had been in the rendo store for no more than a couple of months when it got pulled, along with several other of nikisatez' items, to be released for G2F at Daz. Most likely, the got an exclusitivity deal that made them pull it from Rendo, as to why they didn't release the V4 items at Daz as well, I don't know. Maybe they already had a deal with Rendo that prevented them from moving it over?

This has been happening to several vendors. Mec4D removed several of her items from her own store, to release them exclusively at Daz. She had been working on several outfits for Dawn, but decided to release them for G2F at Daz instead, and she said herself that she will not be allowed to release them for Dawn at a later point, because they are Daz exclusives.

Money talks, simple as that. Daz gives better deals than other sites, and vendors need to make money. I don't blame them, but it does annoy me. shrug