You guys are missing something.
Diablo 3 AH is a free market. It something is rare and wanted, in a open market, the players (market) will decide the price based on the "invisible hand" concept in economics.
Less rare, less demand = less resale value
More rare, more demand = more resale value
The market is the same for everyone. If you are running (1) bot for exactly (1) day will have the same expected value regardless of whatever loot you actually find or don't find.
Short Summary - It makes no difference how "rare" specific drops are, you will always be able to sell them for a value directly tied to their demand/drop rate. The rarity of certain drops don't effect your expected overall net botting income at all.
For example, say you make $50 a day botting and then blizzard randomly decided to increase the drop rate of all legionaries by 1000%. If nothing else changes you can still expect exactly $50 a day.
As a botter, IMO, you want the rarest drop rates possible because it forces casuals to use the RMAH and buy from you because they cant grind for 5 days straight.
Anyways, if the RNG is broken, its broken for everyone and makes no difference.