I sell e-books and they almost all get pirated. I don't care, I just focus on the people who want to pay for my stuff. No skin off my nose if they don't.
Same here. A file that can be copied infinite times without cost is not worth much. I put 2 years of work into a book that gets pirated all the time. I have no problem with it at all.
I think we would be better off reevaluating business models rather than suffering the effects of trying to preserve out-dated ones.
That's probably the best attitude to take since you can't ever stop the infringers. And if you do try to stop them you're only making it more complicated on the people who do want to buy your content.
I buy lots of ebooks and music and the key for me is making it easy to pay for (Amazon and ITMS are great for this). I don't want to jump through hoops to give you my money.
Contrast this with the movie industry who I think are setting themselves up in a way that's pushing infringement with all the rules around renting, buying, streaming, and NetFlix. For example, I see a commercial that a movie now 'in stores' so I check NF. If it's not there and I really want to see it, I'll check the iTunes and xbox marketplaces. When I can't find it there I wonder if they really want my money? They are pushing me to buy the movie, but I don't want to buy the movie I just want to rent it and see it once. I think they are pushing many potential renters to just torrent the movie because they have made it so hard to actually give them money. By this point I'm usually so fed up with looking for the movie I forget about watching it until it shows up on NF.