Mostly customer provided certs, high end clients make all kinds of stupid requests like the aforementioned man-in-the-middle chain sniffers, clients that refuse DNS validation, clients that require alternate domains to be updated regularly. Management is fine for mywebsite.com, but how are you solving an EV on the spoofed root prod domain, with an sso cert chain for lower environments on internal traffic that is originally provided by a client? And do you want the cs reps emailing each other your root cert and (mistakingly) the key? I've been given since SCARY keys by clueless support engineers. I don't want to do this every 3 months.