I was going to say much the same as Jill.
Possibly--not because of the breeding, though at least that does mean he's fertile (if mares are confirmed in foal) and (hopefully) that he's been well started in mannerly breeding habits--
As Jill said, if he happened to be sold for a low price the first time around.... the owner now may be able to sell him for more money. Depends too on other things--what kind of condition was he in when he was sold last time? If he happened to be too thin, or too fat, or too hairy--if the previous owner didn't know how to present him well in photos or to potential buyers that looked at him in person--if the previous owner happened to be an unknown breeder or someone that lived in an out-of-the-way location and couldn't attract potential buyers--any of these or a combination of several could have resulted in the horse selling for a lower price than his true worth, and in that case it is entirely possible for the current owner to improve on any of those things and sell the horse for more money. It has happened before & will surely happen again!
There are some people that can buy for a low price, take the horse home, feed him up (or slim him down) and get him in ideal condition, get some
good photos of him, present him just "so" to potential buyers, talk a good sales pitch, and sell him for a lot more money than they paid for him. Heck, there are some who don't have to do much more than talk a good sales pitch and they can sell almost any horse for a profit!
Sometimes all it takes is for the seller to have a big (or at least well known) name in the industry, and people will assume any horse that person owns is superior to the horses others own....and so will be more likely to pay higher prices to any horse that person has for sale. Such is life. Like Jill says, price your horses according to what you believe they are worth to you, so that you're never unhappy with the price you get for a horse you sell--don't let yourself be talked down to a price lower than you prefer to take (some people talk a real good line when they're trying to get a horse cheaper than the asking price--they can be very convincing about why you should give them a sizeable discount--and often that's all it is, a line to get the lowest price possible so that they can take the horse home & resell him for more of a profit). Get the best price you can for your horses and accept that it's possible that there are other people who will be able to get considerably more for the same horses.
And of course it's entirely possible that the horse may be way overpriced and no one will buy him now anyway! Anyone can ask any outlandish price they wish to for any horse they own, that doesn't mean they are going to get it.
I know someone that never lists her asking prices in ads--she'll make private deals, often for quite low prices, but then she brags to other people about how she gets $3000 or $5000 for her horses. If someone she dislikes inquires about horses she has for sale she'll tell them her starting price is $3000, even though in reality she would be happy to take $1000 or less for the horses. Fact is, you cannot believe everything you're told about prices people want or are getting for their horses!