If everything goes right the shipped semen must also be kissed by an angel. More horses can live cover, less can AI, less can ship cooled, less can ship frozen. Shipped semen can be risky to the originating stallion's reputation. Collection can be a hassle. The tighter the shipping contract the less the complaints to the stallion operation.
Various breeds have different requirements for recipient credentials.
Consensus is that stringent rules are required for successful shipping and reciept of semen. The expense to the mare owner must be measured against the importance of the bloodlines. The wait on the mare end is excrutiating after the vet has made the call for semen. Large problems occur on the mare end with recycling. If the stallion is within a one day trailer ride, it might be cheaper to transport the mare.