HTTPS is a far more secure option for hosting your content than HTTP. The latter has remained popular due to its inherent simplicity and for non-secure public content, it has been plenty good enough for most people, even though it is theoretically open to "man in the middle" attacks.
However, Google have been boosting HTTPS over HTTP sites for a while and the combination of this and an increasing number of HTTPS sites have now pushed plain HTTP sites into the minority of page 1 results.
This means there is an increasing case for hosting your content securely, even if the data security of your public content is not a great concern.
If you are a Passle customer and would like your content to be on HTTPS, drop us a line and we can get you moved across.