[Endoperez]

No, it only tells about demand. If there's not enough demand to balance out the costs, going with DD is not an economical choice. So far, Shrapnel's answer has been that there isn't enough demand for DD alone.

If there are enough threads like this, with hundreds of pages of discussion in several of them, demand might be big enough to balance the costs, but there aren't that many advocates for DD at any one time.