Show HN: Ptrfy, simple textbook digitization (opens in new tab)

First, thank you for the feedback; your comment about Amazon was very validating. The pricing model and payment mode (Gumroad) encapsulate and foreshadow a lot about what Ptrfy is focusing on. At $12, we're clearly not going to "Make Everything Digital For All Book Lovers" (1dollarscan's slogan), but we do want to make buying eTextbooks more simple, affordable, and social for those who need them the most, such as college students and technical professionals. We will be experimenting with different formats in the future, but I wouldn't hold my breath, especially if it meant we would have to compete against Amazon. I'll have to think more about how much of a priority offerring PDF-to-X conversions for past customers is, so good question. PDFs are well-suited for use on desktop OSes, which is where many if not most technical professionals and students do their eTextbook reading. Nonetheless, iPads and Android tablets handle PDFs well enough, but rarely do I read technical literature other than mathematics on my iPad, because tablets are much better suited for casual mathematics notes.