Before actually expecting an increase in sales thanks to your great copywriting skills, you need to make sure that your Web copy fulfills a preliminary condition: namely to familiarize people with your product and persuade them that you are trustworthy.
You buy something because you like it or need it. Or both. To make people buy from you, first you need to make them like you. For that, they need to become familiar with you and what you have to offer. Getting personal with your audience makes you more human. But how do you get personal on the Web? With the help of copywriting.