Trulia did something very similar to Bills.com with their landing page. It starts with a simple form asking for "an address" (which sounds less creepy than "your address," although that's what they mean). Below this simple form field is a bright orange button that contrasts well with the hero image behind the form, and emphasizes that the estimate will be personalized to your home.
LeadPages is *not* the same thing as your email marketing software, such as Mailchimp, ConvertKit, or Infusionsoft. LeadPages helps you get more subscribers, but does not allow you to send regular emails to your list. So, LeadPages can be used to grow your email list and then you can use another service to communicate with that list. Make sense? In that case, why would someone want to use LeadPages? Because they offer tons of templates to help you make high-converting landing pages and allow you to easily send content upgrades.