My clan is rank 3, and I have the exact same items for sale in all Sturgian cities as I had at rank 0. Leather lamellar is the absolute best armor that has been available for purchase the entire time, so I sincerely doubt it is tied to clan tier ranking.
For those who have successfully removed "multiplayer_item="true" in their spitems.xml, would you be kind enough to do a how-to guide? Because when I search for that line in the file, I find upwards of several hundred lines containing "multiplayer_item="true". Are you really meant to delete them all just to get items to show up?