MrsPete is correct, and NorthPole hit on a key cost driver: taller doors. 8 ft doors are much more costly than standard 80" units, and if you have a lot of doors, that translates to a lot of $$$.
A cost-saving substitute for taller doors is to go with standard 80" and make the top (header) casing taller - it gives the appropriate appearance (height) and costs a fraction of a 96" door. A 1x8 header trim does the trick nicely.
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