It makes a lot of sense to build your own email list. Visitors to your website will come and go and it is likely that you will not see the majority of them ever again. When you can capture their email address you will be able to communicate with them and get them back to your website.An email list is a valuable asset. You can send out emails to your subscribers promoting products and services that are related to your niche and make a lot of money. Promote your own products and services or become an affiliate and promote affiliate offers for commissions.