[whiletruefork]

It would be great to have the ability to post-pay. I can imagine finishing the book and realizing that it was worth $20, and wanting to pay more. In this case if I come back to LeanPub there would be a list of books I selected to postpay, so after I finished reading them I could judge the true value and pay that (or add to what I have already paid).

[tjoff]

Not sure how well that would work in practice but it resonates well with me. What hooked me was the title and the word free, the advantage with free is that I don't have to make up my mind on how much it is worth. My first reaction was that I could, since it was free, just grab it and see what it was.

But the instant I came to the site I felt guilty. I ended up paying the suggested price only because the suggested price was sensible (if the suggested price had been more I'd probably would have paid less) and because leanpub seems awesome (just found out about it). Since I know nothing about the book itself I didn't take that into account when buying, it could of course be worth much more.

EDIT: DRM-free and giving me multiple formats to choose from (and not forcing me to select one) is awesome and is one of the reasons I really wanted to buy it. Otherwise I would have had to strip the DRM first (I don't accept DRM on e-books that I buy, even if it makes me a criminal).

[peterarmstrong]

That's a really good feature; we'll add this to our queue. Thanks!

[StavrosK]

I'll second that. I think a post-pay model is really useful. The only problem is getting people to come back to pay for the thing.

[pgeorgi]

Combine it with other features (Write the author, discuss the book with author and readers, rate the book) and invite the reader on the last page of the book.