i got it this 3 recipes from blinking yellow mob in Crystal Mine Lot -1 F
How much i can earn selling in market?
That is entirely up to you, each servers market is obviously different
The choice of Do I get the materials, craft said item and sell it for X amount
Or Do I sell the Recipe for X amount, I mean what if someone bought it and flipped it
My advice, if you can use it hold onto it. If you cannot find yourself using it in the future then I would grind for the materials to craft it, someone is bound to need it