How many times do you ever return to a web site that you visited randomly? Even if you bookmark a given site—even if a site is really cool? Probably not very often; instead, it’s a matter of “out of sight, out of mind.” Your visitors will be the same. Once they leave your site, they will never think about it again . . . UNLESS you capture their email address. Everything changes if they join your list, because then you can use your emails to drive them back to your site (or any site you want to send them to).