Google has started favoring websites with SSL certification (websites with “https”) over regular websites (sites with “http”) in it’s search results.
SSL certification shows that your website is using encryption to protect users and their personal information.
By January 2017, the Google web browser, Chrome will treat all regular “http” websites as non-secure.
With this in mind, yes, I suggest you add SSL certification to your site.
The actual SSL certificate costs about $150/yr (based on a single medium-size website) or $300/yr for an e-commerce website. You will also need some help from a website manager to ensure the certification is handled properly.
There’s no rush on this, but it is something to consider before 2017.