I'm actually kind of against this, the reason being that it opens the door for people who don't know squat about the bloodlines they are mixing to play Dr. Frankenstein. I'm not saying that this applies to everybody; there are certainly buyers out there who will listen to advice given them about the cross, the sport they are breeding for, what conformation and temperment both parents bring to the table, etc. But overall, I feel its better to let a knowledgeable breeder make the decision on how to improve the next generation. I've met too many people who just fell in love with a specific stallion and bred with no thought to the end product. Just my two cents though. I do think its a step up from backyard breeding, but unless you put as much thought into the cross as an honest-to-god breeder would, you won't get the best results.