Perhaps this is a question for another thread, but I'm sticking it here

The few times that I've shipped reptiles, I've always used SYR and with my last shipment, I tried ReptilesExpress. If I ever decide to become a certified shipper, I would only be allowed to ship to other businesses? My reading comprehension may not be up to par this morning, but that's how I read it from this thread. What are the advantages of being a certified shipper versus just using SYR or ReptileExpress?