As said before, making gold on this server is more about quantity, rather than quality, you can trade up with other folk like AC81 and end up with the best the server has to offer(or is willing to part with anyways). This is because even in non-epic area's, you can still find the best gear even running the graveyard, found +4 natural armor necklace there in the summer, 2 mithral fullplate found there in 2018, some decent weapons, and you can run it on a level one no problem.
So, first thing to look at is how much gold per minute you're making in any given area, this can differ from character to character, but the number of bodies and chests that are searchable on a map exponentially add value to the area.
So, mark down your time, and your gold made after returning to the vendors, mark it down and compare notes. Move speed helps, haste helps, carrying capacity helps. This is generally the best way to find out which works best for which characters. Some of my characters solo epic content well, while others do not, and most people on this server don't really care about loot runs anyways (guessing these are the vets who are fed up with the RIG, which is a shame because loot should be a primary motivator in D&D, why else are you risking life and limb, my PC still has to eat afterall).
Time is money friend.
You will definitely find better quality loot in epic areas, but this does not translate to more gold made. Most epic gear is not of any real worth anyways. A +4 quarterstaff might net you 10k in the AH, but compared to a truly epic item, as in things many people want/need (+4 natural armor necks/boots/deflection items), it is of little consequence.
Rinse and repeat, then check your averages after about 3 goes and you'll know just about what happens there.
The more data, the more predictable the result.
Everything you say is absolutely true vexedart, but I like treasure hunting a lot as opposed to simply acquiring gold. And I prefer to fight something that scales some what to my builds, rather than monotonous farming in lower level areas. So its a question of preference in that regard as well.