Just finished a JK run. Came out with 5643 crowns from Moorecroft -> killing JK, and even did a danger room. I usually come out with close to 7k, so there are definitely fewer crowns to be gained now.
Looks like what they did to balance it was to remove drops from a portion of the monsters. Many times, enemies would die and drop absolutely nothing. In which case, they should just remove those monsters rather than doing the work of killing them for no credit, in my opinion.
i joined a group around L10 and to JK kill was 4854. I did get a TV (was kicked from the group). I was estimating about 5k per run.