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This spot is terrific because of an event that occurs nearby. During this event, ridgeback skales attack a camp where you are domesticating crabs. If you can kill these skales quickly, you will end up with several vials of blood every time. While you wait for the event to come back, you can run around the crab gathering area in a circle, killing skales the entire time.
Here's a video demonstrating this Vial of Blood farming spot. I also explain how to price your vials of blood on the trading post. I still didn't have my coffee... so hopefully you find my rambling funny instead of annoying.