Epic Recipes use?

hi guys

since i play this game i think about the use or trade with epic recipes.
i think, only one or two makes sense. the rest is to vendor.
since the prices fall down, they are complete useless? or not?

for what do you use them?

better way to use and rebalance: let us use them in the levels 20 to 37...
in this case they would be helpfull.

best regards