WOW Easy Money Making Exploitable Spot

WHERE/WHAT:

In Northweatern Westfall, running along the cliff, there is a lone
windmill with a tiny shack at its base. It is surrounded by 6-7 Defias
mobs, levels 12-13.

Whats the catch?

They respawn immediately. Get the drift?

WHAT LEVEL YOU SHOULD BE:

I would suggest 24+, however I was 33 when I discovered it, and it is
still extremely useful when you reach 60.

WHAT TO USE THIS SPOT FOR:

1) Grinding/Maxing new weapon proficiencies...
2) Leveling a toon (lvl 5-16)...and getting him rich, as well.
3) Farming Linen. (For you linen clowns, I easily loot 100 linen in
about 5 minutes).
4) Farming these nice little nets that occasionally drop.