Google is going to rank sites served over https, SSL, higher than regular http sites.

Click here for Google's original announcement:
Google Webmaster Central Blog
HTTPS as a ranking signal

Here's the pertinent part:
'we're starting to use HTTPS as a ranking signal. For now it's only a very lightweight signal affecting fewer than 1% of global queries, and carrying less weight than other signals such as high-quality content.'

Notice it says '1% of queries' and 'carries less weight than other signals such as high quality content.'

Google's John Mueller said recently:
'I wouldn't expect any visible change when you move from http to https, just from that change, just from SEO reasons, [in fact] any time you make significant changes in your site, change the site's URLs, you are definitely going to see some fluctuations in the short term. So you'll likely see some drop or some changes as we recrawl and reindex everything.'

Click here to view the source:
Google: There Isn't A Magical SEO Advantage By Switching To HTTPS

If concerned about your rankings

• First we suggest you check your current rankings with Google. You may already be ranked where you want to be. 
• Second, remember that even Google is putting much more weight on high quality content than they are on SSL. 
• Third, Google has indicated that the ranking boost will only affect fewer than 1% of queries. Chances are that SSL will not make much difference at this time.

We've recently added SSL. See our FAQ How to Request SSL.

If you don't request SSL, does that mean your info is not secure?

Not at all! 

Your info is secure. The only thing we serve over standard http is your public website which only contains data that you, as an artist, wish the public to see anyway. You'll notice as soon as you hit our login page to log in to your FASO account, everything switches to https, SSL.

In the not so distant past, the sites that used SSL were financial institutions.

In the past each domain served over SSL needed it's own IP address and it's own SSL certificate. That's why enabling SSL added so much complication and expense. More modern ways of doing it have become available. 

Unfortunately, these modern ways of doing SSL are unsupported by Windows XP and early versions of Android.