You are correct in regards to Transformers being more complex. However, correct me if I'm wrong, I think ever since the transition to more and more plastic and less and less detailed paint application and markings, we are still paying the same if not even more expensive for our Transformers.
What puzzles me is that if you look at say Star Wars vehicles, in majority, they have great play value, I think also much better and durable plastics, weathering and some markings pre-applied - on the whole a much better toy than the TF line ....