Is there group userpoints?

Apart from the site Userpoints,I‘m considering a group userpoints.Because I need my group users to pay their userpoints when attending the events.Group userpoints may be defined per group.Group admin can set the group points achiving rules,such as using Money to buy points,or Posting for points.when group user comsumming their points,different level group user may have different user points price.for example group user Of A level may pay less points than those of B when they take part in an event。that‘s something like shopping to discount by role.