PDFs are fine for computer screens or larger tablets. Maybe.
They are horrible for e-readers.
It's impossible to adjust the fonts with any degree of granularity--in other words too large or too small, not usually "just right." Many people get e-readers because of the ability to adjust font size.
E-readers that attempt to "flow" pdfs end up having weird results in respect to hyphenation and page breaks. These are disruptive to the reading experience. So are the e-readers that force you to either read the pdf in too-small font or read only the right or left HALF of the page at a time. That's even worse.
Don't do it. Or if you must, make the pdf IN ADDITION to the epub offering so those of us who aren't reading on laptop screens can avoid it; then your client can analyze what sells/moves better.
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