By the time you find an academically viable author, get it written, edited, edited, edited, edited, proofed, proofed, proofed, fact-checked and revised and fact-checked again and edited again, designed, typeset (yes, even digital texts must be typeset), configured for all five zillion of the pointless DRM platforms and THEN try to get a lecturer to review and recommend it to his class before you think about things like aggregators/retailers or one's own ecommerce system, then, yeah, sure, not printing it on paper will really cut those overhead costs.
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'Cut overhead significantly'
By the time you find an academically viable author, get it written, edited, edited, edited, edited, proofed, proofed, proofed, fact-checked and revised and fact-checked again and edited again, designed, typeset (yes, even digital texts must be typeset), configured for all five zillion of the pointless DRM platforms and THEN try to get a lecturer to review and recommend it to his class before you think about things like aggregators/retailers or one's own ecommerce system, then, yeah, sure, not printing it on paper will really cut those overhead costs.