I was just playing with a spreadsheet and thought some of you might like this.
A tick is 6sec, so take the damage/6 and you have the DPS.
So in the first tick 12/6 = 2
tick2 24/6 = 4, but now 2 ticks have passed so your DPS over the 12sec that have passed is 4+2=6/2=3 and so on.
Long story short, DPS starts at 2 in the first tick, and grows by 1 each tick. So if you let it run for all 14 ticks, you end with a DPS of 15.
Not a bad DPS for a freebie :)
Sillie 45th Shaman
Guess I should start my epic fun.