13 characters doing 1 emissary per day rewards 10k+ per day. That becomes 70k+ per week. That becomes 280k+ per month, which is effectively 3,360,000 gold per year, from 1 emissary per day on each character.
Add in professions, which if you’re looking to make gold you should be doing professions or else what are you doing saying you can’t make gold. Gathering professions literally always net profits, regardless of anything else.
Add in mission tables, which on average, awarding 500g+ per mission set per character that becomes another 6.5k gold per mission set for 13 characters. This times 7 becomes 45.5k gold per week from missions, passive gold, alone. This becomes 182k a month, which becomes 2,184,000 gold per year.
Again, what gold selling methods are you referring that do not exist? If you cannot make gold that is on you. Level up some characters, buy boosts to get them to 60 even like I did, and do the work to get them going.
That is not factoring in Gold reward dailies, either, nor selling battle pets, farming old raid, etc. That’s all stuff you could do 1 time per character per day. With decent geared toons, assume it takes 20 minutes to do a calling/emissary per day per character, x13 that becomes almost 5 hours, 4.3333 hours worth, or 4 hours 20 minutes.
Some characters will do stuff faster, some will not.
Literally. Easy. To. Make. Gold.
I’d tell them all literally the same thing. It has no place, in my opinion, in games at all. There are easy ways to make gold, now more than ever.
Yes, boosting helps to get you guys gold, but also doing 1 emissary per day for 13 characters does wonders, too, as does doing professions, AH flipping, farming old content, farming battle pets, selling battle pets, running satchels for tanks and healers, turning in the things when you get rep up to max, etc.
Literally more ways than this, too, to make gold. If your guild relies solely on this to make gold you’re either lazy/not actually caring for gold or you’re dead set on just this method alone. If you’re dead set on this, alone, that’s fine, but I, myself, think it has no place in videogames as it takes away from the achievement of even doing it, the prestige of having done it, etc. And it makes the game look bad when you can just buy everything that’s tough anyways, then there’s no prestige in the achievement for getting it.