Not a problem. I am very much supportive of the no piracy policy. Anything else is just going to hurt the acceptance of electronic readers.
To the point about buying after trying, I saw Eric Flint's 1632 (series) as a download. I've seen it in the bookstores for some time now but have never really looked at it. Having pulled a download and read some of it....I now want to read the entire series. And that means I'm now buying the p-books.