@Paladin_HGWTThat is indeed a tricky one. I think the situation is more complicated than that. I have a friend that runs a bookshop and we regularly chat about things from a sellers point of view.
One of their biggest bug-bears, is that they know what sells in the area (of Scotland) however the head office is in England and regularly sends up shipments laden with inappropriate titles (ie, books on the England football/cricket team, etc etc). And the failure of these books to sell, is (according to head office) not the Scottish customer base, but the shop for not 'promoting' the books enough. And yet, they (the book-store) knows exactly what the 'locals' want to read and when they order those books, head office inevitably replies that this is not possible because the 'marketing team' did an audit of a shop in Devon (England- for the non UK) and that is what the General Public wishes to purchase...
I bring this up, because the majority of purchasers are habitual purchasers of the same authors. IE, they find a author they like, they will automatically buy any new book by that author regardless. They will only look at expanding into a new author if they have out read all their usual 'go-tos'. Which makes perfect sense, as that is how it works in other forms of media. "I love that band and can't wait for their new album", "Let's go see that new film as it has my favourite actor in it ..." etc, etc.
This fits in with my second paragraph, because the bookshop knows what authors are loved and when the shop knows a new novel is being released, say, the likes of Jilly Cooper, they will put an order in for X amount because they know X amount will sell. Head office takes that order, compares it to the metrics of a shop in another country, and goes "Nope, you can have a third of that amount and the rest of the shipment will be made up of books on the ins and outs of the financial crisis ..."
What blurbs excel at, is in trying to hook new readers to that author, and 'blurbs' do so by explaining what 'genre' the book is set in. Which can be achieved, pretty much, by a really good cover. Someone who only dabbles in the poo(l) of celebratory biographies, is very rarely interested in hard SciFi. It gives the reader a potential idea of what the story is about. Whether it's the struggles of a rancher in the Wild West, a space opera, a whodunnit, or police procedural. Most of which can be done by the cover (A picture of a wooden fence, some steers and a six shooter in a holster/ A space ship with a planet as a background/ A magnifying glass and some blood splatters/ a simple stretch of police tape). That role is normally taken up (here) by the inclusion of story codes, which Dead Tree Press do not have.
So once the blurb has set the scene (the when and the where, ie Georgia in 2010), it will then mention the protagonist and the driving force of the story (the 'hook')
Abbey is a single mother who is trying to juggle the lives of her two kids and her life as a medical pathologist when she receives several cadavers with disturbing similarities.
Reading that, you know there is going to be family drama, personal issues (She's a single mother) and the overriding plot is going to be whether or not there is a serial murderer on the go. No plot spoilers, but enough information to know whether or not the story may be of interest. If you only read sword and sorcery fantasy, then it's going to be a hard pass.
So basically, my point after all that, is that blurbs are a little superfluous here, because the majority of the blurb's job is actually done by the story codes (if marked correctly) and what you are really looking at doing, is explaining the codes a bit better in slightly greater detail. Like where the story is set, and within what time period. Not much else is needed, without broaching spoiler territory.