One problem with paper books that I see is that you have an ongoing series. You just released the 4th book in the series. The 4th book comes to my attention and I decide I want to read the series. Now I go and try to find say the first three books in the series, will I be able to? Will any of them be out of print? If so, I would not be buying the 4th one because why bother when I cannot real the first three?
I just did a quick look at borders.com and found that I can order Sunborn but not the others. So without the others, Sunborn is not something I am going to be reading. So one way to get sales of Sunborn up is to get Tor to print more of the first three.
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