There's nothing to click, really. I hear this all the time and what it really seems to mean to me is "I don't want to/can't bring myself not to spend gold and do what's needed to bring it in at the same time". I used to be wow poor constantly too, until I realized it was my habits that made me that way.
You don't need to be an AH baron or anything.
Seriously, its as easy as "don't spend gold on anything unless you actually NEED it" (enchants/gems/what-have-you), do gold missions from the mission table (helps if you have alts) and very occasionally go and post some augment runes/various other mats (you can buy with blood if you don't have much else use for them) on the AH.
I make a fairly steady 100k a month doing this and that's a tiny insignificant amount of what I COULD make if I focused on it. Every so often you'll get a pet drop from a paragon emissary box or something, maybe a world epic and you'll get a small payday of 30k-40k.