Damascus Recipe 100% - Mammon

Hi. I have a SK close to 52 and i want to make sword of damascus. I saw the prices at Giran (40M) and decided to craft it. Almost collect most of materials and I am trying to find a 100% recipe. And here is the problem....19M adena!!
I mean the recipe for a same lvl B weapon (AOBA) cost only 5M. Also a 60% Damascus recipe cost 5M....why there is such difference at recipe´s price?
I am thinking to buy a AOBA recipe, craft AOBA and then trade at Blacksmith Of Mammon to Damascus.
I also wonder if i can buy a Kesamberg recipe, craft Kesa and then upgrade it to Dama at Blac.Mammon.
BUT i am not sure if Mammon can trade or upgrade B grade weapons as well as he does with D and C grade weapons....
So any ideas? I am a bit comfused...
Thnks :eek:

you cannot trade b grade weapons at mammon :(

Damascus recipe is rare, thats why it's so expensive. On Teon Damascus recipe 100% is 17mil while AOBA recipe is 300-500k as it is very common. If you want a Damascus, better start making money for it or try to farm the recipe in LoA, since you cannot upgrade or exchange B-grade items on Mammon.

Damascus as far as I know only drops from some mobs and not that high rate, plus it's wanted both as swords for melees AND for duals.

AOBA I know by fact is a common recipe, I've spoiled more then 6 of them myself ^^. All sold for 1m :)