Traditionally I hate proffs and usually never do them. My main has 600/600 LW and Skinning and I never made much money from it.
The most gold I ever made was Mining raw ore in cataclysm but in Mop my server died and ore was nearly worthless like 49 gold a stack at the start of cata it was worth 700 g a stack earned myself 30k gold lasted me the entire time I played.