First of all, I think you're assuming a level of technical incompetency that's completely incongruent with much of what is known about Mrs. Clinton. Secondly,

First of all, I think you're assuming a level of technical incompetency that's completely incongruent with much of what is known about Mrs. Clinton. Secondly, I think your last sentence answers the question. Running one's own email server isn't "normal" these days; email-as-a-service is such an over-solved problem for the average (security-unconscious) user, that going to the hassle and risk of running one's own is generally the purview of people who have something to prove, something to protect, or something to hide.