As Microsoft pointed out in their EU complaint, Motorola's attempt to charge 2.25% of the price of the entire product is outrageous and absurd and an anti-trust abuse of FRAND. They pointed out that there are hundreds of essential patents involved in wireless standards and if everyone charged 2.25% of the product price, a mobile phone would costs many times what it does now!
Surely the point is that if patents amounted to hundreds of percent per unit, the manufacturer would actually lose money on every device sold, regardless of what they charge. That's one way to get rid of Apples cash mountain I suppose!
But I do agree that this is a clear-cut case of anti-trust behaviour from Moto. I think they should be fined 10% of their world-wide revenue for each FRAND violation. Such an example would ensure that companies play nicely in future.