I'm a firm believer in NOT doing dailies for money (rep is another story) - IF you are at a point where you can farm heroics effectively. I've funded 5 epic flyers within a few weeks barely doing any dailies at all. That's 30k+ gold to put things in perspective. Dailies will give you rep and gold and a few other perks but instances will give you rep, gold, badges, loot, enchanting materials, primals, rare/epic drops, herbs (botanica is nice), ore, and you won't have to deal with people whispering you every two seconds wasting your time.

For example, I usually run through a good portion of heroics in a day an end up with close to 40 large pristmastics (every one you loot is still more profitable than doing a daily), about 20 void crystals, a ton of enchanting materials, 15-20 badges, and ton of other stuff. Just yesterday I had 2 of the Eight of Furies cards that sell for 250g (thats a nice bonus that no daily will ever match in a few seconds of looting). At the end of the day or week, dump all your wares on the AH and wake up in the morning with a loaded mailbox of gold. I know people like to say Dailies are the way to go but IMO its a lot more work for a heck of a lot less. That and doing the same dailies every day is extremly boring, at least with instances you can mix it up a bit or bring a long a friend to make things interesting.