No offence, but I think it's a bit of a joke that you've critiqued his customer service on this. Going on the assumption that he did know who you are and what your deal is, then is it really surprising that he didn't say anything to you, when he might have said something to a 'normal' passenger?
Think of it this way, assuming this Guard isn't a member here but had had a heads up about you, all they would have known is that you were some guy who always has a valid ticket which doesn't normally look like it, he should not be questioned and should be left alone as he knows what he's doing. With this is mind, maybe the Guard thought it better to just stay out of your way... At the very least, they'd presumably have been briefed along the lines of 'this guy has a ticket which is valid for his journey, but his ticket probably won't tell you where his coming from or going to, or which way he's going'.
If you're going to play the game when it comes to using obscure routes and split tickets, you can't then complain when someone doesn't go out of their way to second guess what journey you might be making to make sure you've not put yourself in the wrong portion of the train! After all, you're the expert!