A bit more than 2 years ago I reached 1M [http://www.mmo-champion.com/threads/...one-character] and another 2 years earlier I got to 700k [http://www.mmo-champion.com/threads/...u-want-Blizz!] before the great lootgold nerf in 5.0.4. In almost the same timespan I looted 1M instead of "just" 300k.
So first of all the 2nd million was a lot easier/faster to farm/get than the first. 2 main reasons for this:
1. Farming T7-T13 25(hc) + T14-T16 10man almost each week in less than 6 hours for about 5k lootgold before the 7.0 nerf.
2. Farming LFG-Satchels that got buffed to 500-600g some time during WoD to compensate for the gold inflation I guess. This also didn't really help with the whole inflation problem. I cleared more 5man instances during WoD than in all those years since LFG was a thing (1200+). And many of those rewarded a Satchel. Around 160 counted by SatchelScanner (out of date) which I installed only a few months before WoD ended.
Other noteable sources for lootgold were/can be Lockboxes (Elementium/Ghost Iron) and the Bloody Gold Purse for Savage Blood. Now they cut down/adjusted the lootgold from old Content with 7.0 (~1.5k each from Wrath&Cata + ~2k from MoP25nhc (T14/15) and removed the Potion of Luck. The one change that I can't understand: LFG-Satchels reward even more gold (700-850 afaik). They wanted to cut down on inflation, so they should stick to it in every way.
Once again: I don't want a new AV, just to show jow simple this has become with just 1 character. 1M in two years instead of 300k. Lootgold from "old content" that I see as lucrative (T7-T15) hasn't changed much. It still rewards a useful amount that justifies the time investment. The amount that Cata25hc has lost is basically added to Wrath and MoP.
But still I wonder if there is any "competion" besides Farmbots (i.e. those created similar amounts in weeks prior to certain nerf during Cata) since Potion of Luck got removed.