Quoted from Ballypinball:More expensive as its a licensed theme from universal studios
AFMr is the test that will prove the concept if MBr is doable. I think the demand for MBr is same or more than for AFMr. If they hit their sales goal, then adding in the license fee can be factored in.
Someone told me that all creature and monster bash parts are now in stock at bay area amusements. So hopefully thats a sign. If they license one, you figure they would do both or at least discuss it.