Best raids/dungeons for gold farming?

[Sonnillon]

Notes:

• No, I don't play the AH, cause I don't have that much time nor I like it.
• I don't have that much patience to farm matts (mainly because every time I set out to gathering something, I end up being ganked... It gets old really fast).
• AH as with the Horde side of my realm is close to dead or in hibernation.

On to topic.
By running Molten Core, bot Anki'raj's the gold earned was close to 0. Mobs had "loot bags", but those didn't award anything. Me and my friend couldn't get past Leviathan (the horror and the shame, I know) so dunno how worth is Ulduar now.

In general which dungeon/raid (s) are the best for getting some gold? Which can be 2-manned with ease and which are waste of time?