I'm setting up my sales page for an ebook I wrote. On the page I have a 'Download Sample' button that they can use to see a sample chapter of the ebook. My question is, should I require them to enter their email address so I can send them the book link? Why do I ask a dumb question? I wrote an ebook with plans to sell it, but I have nothing else to offer and no plans to offer anything in the future so I wasn't planning to build out a list. But I've been told by many people and I've seen it here many times, that a list is very important even if I don't plan to use it because I could use it one day. So would it be too much to have the user enter their email in order to get the download sample link?