Figure in the time training, equipment, numbers of dogs. Is it really that much cheaper? I can sell my pups for $2500-3500. Yes, that many zeros. Sled dog pups that you're looking at sell for $150? But I've been in this breed for 20 years when there were less than 100 in the US. Reputations add zeros to puppy prices. And I've still retired from breeding.
What do you do with the pups that don't work out for one reason or another? Culling by killing is frowned upon most severely in dogs. At 3 litter a year, average 8 pups- what do you do with 24 pups a year? They take time, money and contacts. You can only sell so many pups to sledders if you and your dogs don't have a good reputation. Sledding bred dogs have a horrible reputation as pets. Do you take back any of your pups if they need a new home? Reason doesn't really matter but a certain percentage of returns might come back with health issues. More money. If your state has a puppy lemon law, you would be liable for genetic and congenital health problems. In some states for up to a year of age and for 1 1/2 times the cost of the pup. Are you ready to lose money?