To quickly max out Power and Influence in Dragon Age Inquisition, do the following: You must first reach Skyhold. Go to the merchant in the Southwest corner of the courtyard (Farris the Representative). Click on Buy/Sell and go to the Other section Purchase whichever of the Influence/Power items that you can afford. DO NOT exit the merchant at this point. Immediately go to Sell and sell the item back to the merchant. Repeat as desired. When you exit the merchant Buy/Sell screen, you will get the accumulated Influence/Power from your "purchases."