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If this horse is sold on for racing and it has proven ability in it's past form, obviously this will increase the price. If it's a youngster of good breeding with successful relatives and signs of future ability then this will also make it an expensive prospect. However, if this horse has raced a few times and was completely useless, no-body in racing would be interested in investing further money into this and these horses can be picked up for next to nothing and are often given away. Sadly, many of these horses are put down.
There are loads of ex-race horses out there that need new homes.
For selling on as a riding horse, previous performance in racing is completely irrelevant (unless you are buying something famous!).
Temperament, confirmation and 'ride-ability' would influence the price.
You will find that 3 year olds just coming out of racing are often not the best general riding horses, but experienced hurdlers that are older can be very good general purpose riding horses and price will reflect this.
One of my ex-racers was sold during his racing career for a 5 figure sum because he was quite successful, he was given away for free after his career finished, and if I wanted to sell him now as a decent hack I could only ask about £1500.- for him because he has a rather peculiar confirmation!
Hope this helps.
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