I believe many people have maxed storage gold. Thats for sure. I remember from different occasions, I have people asking me how I get money to buy my stuffs ie fow armor, weapons so on. There are many people richer than me. So I would not say this is a guide or what. Just probably some sharing of my own experience of my journey towards getting the gold to buy the things i want.
First off, I got to state that I don't farm. Tried UW, but ended up spending more on entrance fee than getting ectos, haha. Most of my gold are from trading.
I started off trading purple Fiery Dragon Swords (hey they are worthed something back at prophecies). Moved on to SF greens after they came out and later to other higher ends golds.
There are many form of trading. Namely: High Ends, Low Ends, Greens, Mini pets, Festive items etc. I wouldn't say there is a best form of trading. I have a friend who managed a stack of ectos simply by trading low ends.
Another way i made money was by running missions. In the past, running missions is done with friends or guildies (if you can't solo), so you got to split the profit with everyone involved. Now with the introduction of heros, I realised that if I run missions with heros, I only need to share with them :P . And that means I got to keep everything

Ah forgot to add that a being thrifty do helps a lot.
So how about the rest of the guild wars community... come share your gold hunting experience
