By now, your customers trust you (as they should!). They’ve received all the benefits from the top of the funnel (the freebie they registered for on your website), and the middle of the funnel (be it emails with great content from you or otherwise), and they have some sense of who you are as a person. This is where you ask for the sale (hello, bottom of your funnel!). You want to continue to engage, of course, but you also want to offer something of even more value to your customers.
However, what Brunson cleverly conceived with ClickFunnels is to create a SaaS that can integrate with the world's most popular platforms and virtually anyone can quietly launch a funnel in hours as opposed to weeks of hefty coding and programming. As a fervent user of ClickFunnels myself, I can tell you that the system is impressive beyond measure.