~ Both markets were protected by Tor and yet servers were located and one of them was made honeypot. An owner of one of the markets had four luxury cars and lot of money so everybody was asking - why keep risking a good life to provide darknet service? BitMixer owners probably asked it themselves and the answer was - it is not worth it anymore.
it is always their own fault for slipping. they do all the security measures for their servers then they use same credentials for their emails in multiple places and leak a lot of their information. i believe that was how they caught them.
it is like the KickAssTorrent owner guy who was using coinbase for his bitcoin wallet and made purchases from iTunes IIRC!