This in my experience is not uncommon in the industry, especially with open source. Much of the software out there uses SSL and https for the purpose of securing critical pages such as payment processing. Sure you will find software this can handle the https and SSL for the whole site, but you will find more than not that they are written an or function with the intent to secure more critical pages, features, and functions that really require it.
You have to remember folks that with open source your pretty much getting the base or basics of what you need. The rest is up to you. My feeling is if your looking for a tried a true, all feature, all doing, everything in the box social script, they are out there for several hundred dollars but not open source. Free has its down sides but if you have the willingness and want that flexibility of open source then you also have to deal with certain challenges as well.