Good question.
Answer is its not licensing fees that are driving the price up.
Very few factories having the skill to make high end collectibles so those that can do it, are raising prices. If company A isnt willing to pay their rate then company B will.
There is a particular company, not naming them, that have almost single-handedly cause ALL collectibles prices to go up because they are paying over-market to the factories for prime positioning.
There are also far too many companies making collectibles now so, as mentioned above, there is always someone thats willing to pay the factory a little higher than the last guy...that causes prices to keep going up.