yeh, think i did the same on my honeymoon, purchased tickets, took the monkey suit so we wouldn't have to worry about the liquids/gels. But only introduced myself to the crew for the sake of some FA or Pilot saying "there's a pilot back there who didn't introduce himself, what a jerk".
Just didn't want to be like me seeing a crew member get on and walk to the back, you never know the story, they could be jumpseating, and rude, they could be deadheading and ok, but you don't know, which is the only reason i try to let them know the circumstances of my travel. Plus who knows if there would be a situation in the back that they might be able to utilize you for, hard to do if they don't know you're there.
PS- Be real nice to the FA's though....they control that cabin, if you're nice, you MIGHT find yourself bumped to 1st.