As far as I remember the Crucible was the home for custom map aficionados before the latest patch / brewing system / new players.
Today the list of most played maps reads: Apartements, Kessel, Iwo, Bridges, Winterwald....
All those maps can be played on every other server and for some of them there are even dedicated servers running.
Custom map aficionados have to be lucky to play ANY custom map on Crucible at all since there are always enough other players voting for the well-known maps.
How about limiting the Crucible to custom maps? Is there some reason for the common maps on the Crucible?