Miller turns 30 years old in a month. Getting a first for him isn't an unrealistically low offer, especially if Miller only wants to play for a contender.
yes, it is low. You've been touting what a difference maker he is - and it's pick 31, not a typical first. Remember the Broncos would be paying $19 million of his dead money, so presumably he's a bargain.
In any case, the Broncos have no real need to move him, and especially at a bargain return.