If you do this you won't get the super high pieces (those that need 100-150 bits), you must already have a dig site in the place you want to activate it, it can only be activated in Kalimdor or Eastern Kingdom, and have a 24 hour cool down.
So an example;
I all of a sudden needed 200 Night Elf pieces (sorry I forget what its called), and have like 3
I have 1 dig spot in Felwood,
So I activate this ability in Felwood moving the other 3 dig spots
I make the artifact and now cannot get another big item for say a week or something
(the long wait times is to discourage people from doing this over and over again)
-I apologize if this doesn't belong here but I thought it would be a good addition to the game