To much work too little gain IMO.
I'd prefer a way of looking at a recipe and be able to see the enhancement sell/buy prices for that recipe, rather than having to look each one up separately.
I admit that wouldn't hurt, and might actually be more feasible. Obviously the salvage ingredient prices could be displayed at the same time.
My suggestion's pure wishlist stuff - but hey, if we don't ask we won't get it. I don't think the gain is that small - a greater chance of selling an apparently worthless recipe would be nice, and cheaper prices for crafted enhancements wouldn't hurt either - obviously they would be expected to get cheaper because the supply would have been increased.
I know markets automatically buying and selling items at vendor prices is a hardy perennial.
Here's a more radical idea with, for an additional plus, more development effort involved (oops). At the moment, a lot of orange recipes are basically worthless as they are. The enhancements sell for a fair bit, but often the wait time to sell them is considerable. And, fundamentally, the recipe and the enhancement are in a sense the same thing.
Suggest that if a recipe is for sale _and_ someone is bidding for the corresponding enhancement _and_ the market sell prices of the salvage plus the recipe plus the assembly cost are low enough - the market does the work; the relevant salvage is bought, the enhancement is created and sold to the bidder, and the recipe seller gets the leftover influence.
It would save a lot of "should I craft this?" tedium, and also make it easier to buy the enhancements (and unless you actually held the relevant salvage already, you wouldn't have to dither over whether or not to bid on enhancement or recipe).