I equipped my first barb for 2m and was able to farm Act 1 with no MF on gear.
I have since put another 5m into it, and a couple of dropped items have been equipped, to boost MF to over 200 with NV. That money includes putting MF gear on Templar.
(For some reason I was noticing that legendaries were not dropping near as much under 100 base MF, so that was my goal was 100MF base for more legendaries. Got 4 legendaries last night. They are all still junk, but hey.)
The Barb is making 100k GPH, not counting crafting materials from salvage. Add it all up and include the millions in gold from drops and I would say my barb is doing as well as my best DH Sarkoth 650k GPH were before bans, if not better. For significantly less up front cost.
The only problem I have now is gold does not sell.