I see, thanks for that!, I'm a partner and I haven't got the tab yet, but even when I get it I probably wont use it!This should explain it all!
http://youtubecreator.blogspot.co.uk/2012/05/youtube-merch-store-for-all-partners.html
noThat's weird. I thought it was only available to musicians originally. Now it seems like they're offering it to more people though. Do you plan on using it?