In general, I agree with the sentiments expressed here. I do believe, though, that it does depend on the type of coral to some degree.
For those coral that are sold in a fairly standardized fashion (ie high-end chalices are typically sold at a certain size for frags and usually include at least one eye, but are rarely sold with several), I can see how it really makes the most sense to make the frags, let them heal, and then offer them for sale. However, for something like high-end zoanthids where they are typically sold by the polyp and someone might want anywhere from one to 10 depending on price, it is harder to pre-determine a good selling frag size, and it is common practice (and makes sense) to post a morph for sale with a per polyp price and allow buyers to decide how many polyps they want cut for them. In this case the frags are going to be custom, and it only makes sense that the frags will need to be cut and allowed to heal after the order is placed.
I don't think this is anything new or unusual. Online vendors typically have shopping carts setup on their sites and you place your order and pay and in many cases the frags are not pre-cut. I actually wish more vendor sites would enforce/allow a waiting period after the order to allow the frags to heal. I don't like getting fresh-cut frags the day after. A few days allowance for healing, or even a week wouldn't bother me. Again, in the case of chalices (which people on this thread seem mostly to be referring to) and other lps where they are usually sold in a fairly standard quantity, and where they have a more intensive healing to undergo, it does make less sense to pre-sell, IMO.