We talked about this a while ago in the guild and talking about if using humidify actually does make profit. Well I looked into it more and read some guides about how to merchant using humidify. THere are a few things to make profit.
you need to make your own astrals
buy the same amount of fire runes as astrals and obtain a water staff (you can use a steam staff if you don't want to buy fire runes its just that astrals and fires need one of each as waters are 3 per cast)
buy the amount of empty vials using this formula
astrals x 26 = the amount of vials you need.
one cast fills the entire inventory.
and if you do everything correctly you should be able to make profit.
*notes*
you need 68 magic to cast humidify
you need to have done lunar diplomacy and dream mentor to cast the spell
