Everyone is selling something. It might be a product, a service, a download, an idea, or a worthy cause.
Whatever you’re selling, it’s got to be worth the price. (And never forget that reader attention is a valuable commodity that’s in strictly limited supply.)
Whether you’re asking for dollars, euros, yen, or valuable time and attention, you’ve got to deliver something that towers above your asking price.
coutersy of http://www.copyblogger.com