I have gone on at length in the past about inconsistencies in Warehouse 13 regarding the generation of artifacts. There seem to be few rules governing their creation. All that seems essential is some event that is very important to someone, usually a prominent person. (Do prominent people have more psychic energy?) The most interesting recent artifact in the show was the doorknob from the Triangle Shirtwaist Factory. It absorbed the pain and suffering of the 146 working-women who lost their lives in the famous sweatshop fire. When held for an extended period of time, It causes the victim to be engulfed in flames. The door was locked to prevent the workers from leaving early.
It is interesting that the knob does not transmit pain and suffering. It transmits fire (which causes pain and suffering). It would be much more energy efficient for it to cause psychological pain.
But, we now have a new reason for villains to torture people. Doing so turns the instruments of their torture into artifacts! Harness the power of human suffering! Rule the world!