Tons of horses are sent to slaughter because they were bred for color or so people want experience with a pretteh poneh. Those arent reasons to breed. That is why the market is flooded with thousands of horses bred "just because". Go to any auction and you will see plenty of riding horses that are young and ridable but no one wants them. Why? Because of irrisponsible people who get their hands on an animal with the equipment to reproduce.
If you don't have a quality animal to breed, it is irrisponsible to breed. If people don't have the money for a stud fee how in the heck can they afford to care for a mare and foal?g