I can solo flames in the 18 mins riding my horsey, it's pretty easy unless someone interrupts you by doing dailies.
The biggest thing about flames when someone else is doing dailies is to NOT move your mouse and use your right mouse button to click on them. Once you see the action icon, just keep it there and right click every time the action icon comes up. I can generally get over 4.5-5k points that way.
If you are alone, then you have the 2 fire spots and it's possible to get 6k solo. Just run back and forth between the two.