It seems to me that all this fuss about Inferno was started solely for the sake of an argument :D Just to make things more interesting...
It's true that things are a bit dull on all the Heroes portals right now, but this is a pleasant and useful learning experience.
P.S. Regarding mercury - at the start, you get 4 units of mercury on difficulty level 160, plus you can get a bonus of mercury, which is another 3-6 units... and then there are mercury mines/piles, which can contain 3-6 units each - so you need to find only 3 mercury piles, which I think is quite realistic.