With one stack of 99 bolt heads, at tier 1 HQ rate, I get nearly 3 full stacks of quivers. Usually two of the stacks breaks me even, and the others are profit.
Usually the same for demon arrows, but sometimes price fluctuations and AH flooding make the arrows cheaper to buy, than to make yourself.
Just watch the prices. They can all be profitable, just have to play it smart. (oh and if you have a crafter friend to make you bolt and arrowheads, exploit them
)