1) Are public domain books harder to sell, because they are not written by some well-known "industry guru" or "expert" that many people would recognize today? How do people typically get around this barrier?
2) How do you usually obtain testimonials that are necessary for establishing social proof in the sales letter for public domain content...especially since you are technically not the "author" of the content?
3) How much time does it usually take to find, assemble and then sell public domain info products?
4) How much money do people usually make who sell public domain content on the Internet?