If the components of the second and third recipe are similar, then the result is frightening. 5*2.5*3 = 37.5 million gold, at current rate of 260k, that mean ~ 144 FSP. At invention chance of success of 67% that quest is not Epic, it's Pan Galactic Gargle Blaster.
Even if you activate some Inventor II, you will be very lucky to finish at ~ 120 FSP.
Sad i spent all of mine FSP's for max stamina, and don't have enough to test it, and report the results.
Good luck to all (o;