I do daily crafting writs on 18 characters and have noticed in the last two weeks I've not been getting as many Clothier or Jewelry surveys. I didn't get a single Clothier survey for 3 days in a row, then I got 5 or 6 to drop, but now my jewelry surveys have been non existent in the last 2 to 3 days. I haven't had any issues with Blacksmith, Enchanter, and Woodworker surveys.
Is this just bad luck on the drop rate? I can barely keep enough supplies for Ancestor Silk and Platinum Ounces to do the dailies on 18 characters to begin with. Then if the surveys stop dropping, I'm completely hosed on supplies.