It's good and fine that Network Solutions guarantee that your website is secure, whatever they mean by that, but that doesn't mean that e.g. man-in-the-middle attacks can't insert themselves between a customer and you site and intercept or change all network traffic. https is an excellent way to prevent that.

But you don't have to pay through the nose for that, $9.99 a month is a rip-off. Use Let's Encrypt which is free and (according to Wikipedia) is used for certificates on 265 million websites, including mine. To set this up, I had to run just two commands on my Linux web server, and the certificates are renewed in the background automagically.