I believe it would be unethical to grab download a copy from say, Project Gutenberg, then turn around and upload it for sale with absolutely no enhancements; but what you've done is entirely different. You've formatted the work and worked out a unique navigation system. In short, you've added your own labor to the work, and as such, you are entitled to be paid for that labor. That reviewer is way off base with his criticism.
The labourer is worthy of his hire.
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