Although your thread has already been answered by Staff, I want to give my opinion about this.
In my opinion we (regular players) can't know how many moderators (for example) Cubecraft needs to keep running in a good way, if there is a lack of administrators or when they need to hire more helpers, it's an internal duty.
However, I understand your idea about rewarding Sr.Mod's (e.g.) for their hard work with the community, I have been Staff Member in two different servers (one Spanish and one English) and you feel very fulfilled when they promote you for your time, work, dedication and effort.