I don't know anyone who runs heroic 5-mans for gold. It's a ridiculously wasteful way to go about things.
---------- Post added 2012-10-23 at 11:54 AM ----------
If guilds have content on farm, then what they're doing is farming. They're repeating content they've beaten for the purpose of making gold. You cannot compare farm raid content to competitive BGs. Apples and oranges.
A lot of raiders simply stop raiding if they're geared and the content's on farm. They don't keep at it week after week, unless they're doing it for gold, and that's no different than any other kind of farming.