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Which is BS. They should retain whatever loot bonus you have when you acquire it.
That would be rather hard to implement though. There's a hell lot more data to store (each loot value of each trophy rather than the amount of trophies, and there's problems such as when you're buying a trophy at the bazaar, how do you know its loot value?
I was thinking along the lines of ranks of trophies. Higher difficulties gives a chance to drop a rare class of trophy while lower gives a crap trophy.