Cases don't have to be reloaded until failure. They can be recycled or resold when case length is long enough to require trimming. Even so... I've seen some reloaders get as many as 15 reloads out of LC 5.56 brass before there were a large number of neck cracks - having never needed to trim a case.
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Can you explain? IME, too short(hard for me to achieve) will shorten case life. Too long and it will not lock up.
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Head space does matter.
My comment was meant to be more along the lines of, "There are other ways of making sure you don't mess up head space, that don't require special tools."
-Such methods can be found in nearly every reloading manual, and some sizing die instructions.