I do agree that making there a way to keep the server a bit more active near ladder reset would be nice.
But raising drop rates or lowering hadriel vendor prices doesn't seem like the way to do so in my opinion.
I don't entirely think of it as a terrible idea, but I highly doubt Game would fancy this idea.
Any new players who hear about the reset in a few days/weeks/months will have two choices.
They can still play and test out the Annihilus content they've yet to see while they still have time.
Or they can have patience and wait for the next ladder like everybody else.
I wish I had a suggestion to keep things active at late ladder but I just woke up and I'm drawing a blank.