For low levels the destroyer rondos are your best buddy at gold making. I recently started new char since I wanted to test Europe areas. What I did was that I kept all the items I found from levels 1 to 18 and then used destoyer rondos on them to turn them to elements. I teleported to Hotan and put up my element stall and went to sleep. In the morning I had gained couple millions from the element sales.
I had now enough gold to buy wolf and start the next gold making round: This time I used stall network. I bought all the 2,3,4 degree items (normal and blues) in all towns that were sold in stalls which had lower prices than the NPC items in their shops (yes, I had written down NPC prices before this). I then used destroyer rondos again to all those items that I bought, went to Hotan and put up my element stall again. Result was about 3mills after the sales (at level 18 )... Destroying items and selling elements give about 600% profit at the moment with current element prices.
I used this same tactic 1.5 years ago when the elements were introduced into the game and I'm now amazed that the elements are still priced so high that you can even make 200-300% profit by buying NPC items, destroying them and then selling elements...
What we learn from this:
1) Do not sell your weapons/armors etc. for lower prices than the NPC prices are ie. if armor chest is sold for 40000 in the npc shop, you must sell the armor chests you've found for more than 40000... price should be set so high that it overweights the element sale profit if you destroyed that same item. Usually the price for item has to be 3xNPC price or more or you still make better profit from element sales.
2) Don't sell any items to NPC shops
3) Don't destroy rondo SoS items
4) Always loot all element items (they're worth more than the gold drops from the monsters). Follow some gold bots, they usually leave element items on ground.
5) Do not make trade runs when you're low level (profit from elements is just so much higher)
6) Sell elements for high level players ie. in Hotan. Don't bother to stall them in lower towns, rich people aren't there!
7) Sell elements in nice amounts (see alchemy tablets what amounts they usually need)
8 ) When low level, join parties always and kill party mobs. You get lots of items much faster => faster element profits