Ummm I would think it backwards... andy worth the least and baal the most. Sure people do alot of baal runs but
A)They take a hell of alot longer than an andy or meph run.
B) Noobs can kill hell andy and farm her easy, not so much baal.
C) Im not entirely sure about this, but it seems the droprate off of meph, and baal even moreso are lowered. I do mf runs all day. Andy meph baal. How many baal essences u think i got to andy?
The worth however, not a clue. Im surprised someone hasnt taken the 2 secs it takes to type it. I would like to know prices for HC as well if anyone knows.
I hink they are all pretty much worthless. I stopped picking them up after I had 5 of each on my mules. I guess those from Meph and Andy are worth 1-2 pgems while those from Diablo and Baal are worth 2-4 pgems. That makes 6-12 pgems for a set, but they are probably hard to sell, at least on ladder where each character has 3 respecs from quest rewards anyway.
I think their worth pretty much depends on how much the person looking for it needs it. I remember 4-5 days into the reset I was in need of one and since the price hadn't been decided, most people would only trade them if you gave them a good deal, so I traded an Ohm for one (really dumb now that I think about it) but I was specced fire and out of resets, and I really wanted to spec light.
So my guess it maybe in the pul range, if they really need it. Maybe more if you get lucky. But most players probably won't want it since the majority of people now have builds that can do all the bosses and get the essences for themselves.