Shortly after the World of Warcraft community got a solid confirmation for the fabled gold limit cap, a German player named Tyram managed to be the first solo player to hit the gold limit. World of Raids forum got a translated version of the original German interview at WoWZene.de.
Here's an excerpt from what he had to say about his achievement:

Unowiel: Please introduce yourself to the community! Whats your name, how old are you and where are you from?

Tyram: My name is Christian, I am 28 years old and I'm from Hamburg.

Unowiel: Since when do you play WoW and how many hours do you approximately play each week?
Tyram: I am playing WoW since February 2005 and I play around 35-40 hours during the week.

Unowiel: Alright, so you are quite a real hardcore gamer since the beginning. What is your current Job?

Tyram: Yes, you can pretty much say that. I am currently working in public service.

Unowiel: Great, so you are a real banker or something. *g* Now lets get to your WoW-Being. You got a lot of attention today and eventually gained a lot of fame as well when you started a thread in the official Blizzard forum, asking why you could not gather any more gold. It turned out that you reached the gold cap. What kept you motivated to keep collecting gold?

Tyram: Well, it all started when i was saving up for my first lvl 40 Mount. Back in the day i started trading, because it was simply the fastest way to get gold. I used to farm "The Green Hills of Stranglethorn" in Stranglethorn which were needed for a quest (there were 15 different ones) and then i sold them for 50 silver up to 1 gold. That was a lot of gold back then.

After that i got to know the auction house and bought cheap stuff and sold it for a bit more. Also the trading channel was in my field of view and I kept checking for cheap offers. That way I gathered a lot of gold quite quickly. I studied the patch notes carefully so I knew what was needed when the patch was about to be released and then I sold the needed items for more than they were normally worth.
This is how I gathered 27.000 gold before the release of The Burning Crusade...

Read the rest of the translation at World of Raids forum.