I would think that the main use of HTTPS is to secure financial transactions online.
As aggressive as Government monitoring systems can be, i highly doubt that they are willing to commit financial theft and fraud.
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More generally it's to prevent eavesdropping. Also, while not financial theft, [url=http://www.scmp.com/news/china/article/1266821/us-hacks-chinese-mobile-phone-companies-steals-sms-data-edward-snowden]it has been stealing phone data from the Chinese[/url].