Professional Farmers

[fractaled]

I think that most capped characters actually make much more than this.  if you are talking about just doing small scale raids, it's not much more.  Maybe around 3-4g depending on size and luck of drops.  Most vendor trash in the 55+ instances sells for 80-2g easily so 1 or two drops of that and you are already over your estimate.  Add in possible BoE greed drops and that shoots up by a lot. 

Even if you look at an hour of farming for gold most players could get at least 4-5 gold in an hour between cash drops and vendor trash.  Then add in cloth and other items that you can AH and your GPH is more like 10-15 and that is a relaxed estimate.
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I was able to do 8-12 gold in 45 minutes by farming the ~48-50 turtles in the hinterlands. This was back when there was no town there though, so it might be more crowded, but it would save the travel time to a vendor (Tarren Mill for Horde). This was also with skinning, as a balance druid. So downtime was minimal, and I was able to skin others' leftover kills, but kill rate wasn't great. That's also not including rare drops that would improve the gold rate, but didn't happen often.

That was the highest area I could farm with no risk watching TV. With better equipment, who knows. I showed a mage friend the area, and he was able to get about 5 kills in the time i got 2-3, and had to sit and drink in the time it took me to get another (he wasn't a skinner though).

I think ~3g an hour is reasonable if you're doing incompetent instance runs. No idea as for raids as I never did any. Bad runs can obviously cause repair bills to mount of course.