mastercraft is around 16-18%, field 3 is around 22-24%, this is as of the implementation patch, percentages like these usually get messed with by the devs each patch due to economy tinkering

Even with relish you will still pay well into the 7 figures to get a toolset, considering the time it takes to get them unless you got 8 figures sitting around you don't care about then they aren't worth it... just wait till the next patch when their cost drops and save your time/cash