Most of the people stick to the GPH scheme, thats very inaccurate. The shuffling is most profitable generally, no matter what you shuffle, thats why GPH per botting char is nothing compared to the shuffled stuff, gained by the bots.
And again, this still dependent off the realm you operate:
Something like Glyphs for example, worths virtually nothing on Stormscale, you can barely make 2x profit off every Mop herb stack, but on Kazzak they are going very well, and you can make 3-5x profit off every stack.
The same apply for gems, too. On Outland, metas are going 120-130g atm, but on Stormscale, they are 200+!
So, the final gold gain could be done even without tons of botting, but with smart shuffling and feeding AH, you dont need to recklessly bot some gather accounts 24/7 to make the big cash, but do it smart, there is tons of other options here, beside the bruteforce farming.