Covey,
We would love to give you a guided tour, but not allowed. We would love to take a picture with you and the family at the gate in the cockpit after the flight, not allowed. We would love to stand at the door and thank our customers, but too much paperwork, logbooks, voyage reports, cabin crew logs to sign, etc. So when you don't see the cockpit crew, it's not that we are not appreciative, there's just too much to do afterwards, and I doubt you want to wait around for us to finish our work and have a chat.