Breeding dogs isn't a guessing game, good breeders stack as many odds in their favour as they can, in the case of lurcher breeding using parents that are workers, dogs that have done a bit and better still from tried and tested lines etc
In the case of some of these puppy producers they advertise constantly, which sticks in people's minds, they use others with clout to build dogs into something their not and they produce loads of pups
Collie crosses especially the first cross overall are a mediocre working dog, they are never going to be world beaters but they will suit novices, part times