I do not think it is the F2P crowd that is the problem, they are probably the scapegoats of the real issue, the OP mentioned.
I am a subcriber, and have recently returned. I have 3 50's previously and started a new alt to level up. I waited approximately an hour to get into an FP, and when I accepted to join I teleported into the starting area of the FP.
When the first dialogue encounter came up, my game crashed to desktop. Something completely out of my control, and when i log back in, the tank drops the group, and the healer calls me a dumba**? Attitudes like this are what make people drop games like a bad habbit.
Edit: the healer and tank were both subscribers