Help me understand rebuild vs crate?

remember it doesn't have to be a "crate" either there are plenty of reputable builders that will build you one of their"package"motors for a good price and stand behind it .How many of these superstars are going to send you new roller rockers plus springs and retainers for free when yours fail ? My builder handled swapping the bad parts with the manufacturer for new at no charge after the motor had been in the car for 5 years it's easy to chirp on the internet about what you may or may not be doing it's a different thing to nut up when things go side ways .