A good preacher ought to be able to get 70% of the people who showed up on Sunday to make a donation. A teeny bop rock group might convert 20% of concert goers to buy a shirt or souvenir. A great street magician can get 10% of the people who watch his show to throw a dollar in the hat. Direct marketers used to shoot for 2% conversion from a good list, but now, that’s a long shot. A blogger might convert 2% of readers to buy a book.