With the AH flooded with MoP mats on my low pop server its hard to make any money off them, however prices on many cata mats skyrocketed shortly after MoP's launch and appear to only be getting more expensive. If embersilk cloth / hypnotic dust sell for a lot on your server you can make 7-10k in just an hour of farming!
This works great if you are on a low pop server embersilk cloth is 70g a stack and hypnotic dust is 11g each! Also good call on the helpful wikky whistle I just assumed it only worked in mop zones