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It works fine for corporate mail where everyone in the organization would have a certificate issued to them, but does anyone use certificates to sign their personal mail (let alone use encryption which would require the recipient to have a certificate as well)?
As far as I've observed, everyone uses Gmail or other free webmail in their browser, and this when they're not using Facebook.
I've tried certificate based encryption with a couple of tech minded friends (and also used the android app Chatsecure with certificates), but it runs into the same problem of not everyone having or bothered with certificates.
I'd say the cost benefit for privacy tools for general public isn't yet worthwhile. Whether this, or TOR or VPNs, they're either too complicated to set up or require everyone else to use them, or, in the case of anonymous publishing like I2P or Freenet, lack enough content. – Rex – 2015-02-24T19:34:04.943