We actually use Keybase as well, and that was one of our inspirations for the exact same reasons! Since one of our main use-cases was to receive secure data from non-tech-savvy people we wanted to remove as much friction as possible, and that included sending the encrypted blob. We're actually thinking of ways of integrating Hawkpost with Keybase.io, namely fetching/verifying keys (as we already do with keyservers).