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Please don't take my comment as judging, I'm sure you work hard and it's your right to spend the money on what you desire. And though I make a decent salary now, €800 is still too expensive for me.
Back on topic, the textbook I had was available as an html document. When I loaded it, my e-reader didn't display all the characters present in my language, even after fixing the encoding. Converting it to epub didn't solve that problem, nor did embedding the fonts. I could never get all the characters to display properly. It was extremely distracting, considering I had to study it for an exam. It also had a several different sized graphics, as well as specially formatted pieces of text which had to stay formatted that way. That's why creating a document customized for my e-reader seemed like the perfect solution. Otherwise, yes, going to epub makes more sense. But sometimes, you really need to lock things into a certain display size.
And have in mind that I converted a .doc into a .pdf, so I had the chance of editing the page size, margins, font, and if the document had two columns I would have also converted it to a one-column document. Two columns on a 6" device are doable, but not very good. You would also have to make sure to contain any larger graphics in a non-breaking section and set it to one column if you wanted to keep the text two columns.
So, I think the key to a good .pdf is starting from an editable document and customizing it according to your needs before locking it in place.
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