Hopefully people will understand this isn't to manipulate the price of natures... Anyway here's a guide to earn money/hour comparable to high level PvM.
However there are 2 strict requirements
Level 91+ RC
Wicked hood teleport tokens
Obviously buying keys for the tokens isn't worth it, but if you find these tokens in your bank like myself, then be sure to use them! (1 token = 3 teleports!)
Trips including banking (refilling pouches + Etheral body + familiar) took me just under 30 seconds. Each trip i managed to craft 190~ nature runes. That meant i could craft ~380 nature runes per minute.
This came to a total of 156,940 gp/min.
156,940 * 60 = 9,416,400 gp/hour!
However this means that if we take into account time repairing pouches and the cost of pure essences the total per hour will be more around 9m.
Have fun!