A device, system and method for allocating resources for video streaming is provided. A device determines respective differences between reserved and actual allocated resources for videos provided to a streaming system by client devices, and selects, at the streaming system, first reserved aggregate allocated resources, from discrete selectable allocated resources, the first reserved aggregate allocated resources for streaming the videos to video-playing devices, the first reserved aggregate allocated resources selected based on: the actual allocated resources for videos; and respective associated regions of the client devices and video-playing devices. The device monitors used resources for streaming the videos to the video-playing devices and, in response to determining that the used resources are within a threshold value of the first reserved aggregate allocated resources: from the discrete selectable allocated resources, selects second reserved aggregate allocated resources based on the respective differences between the reserved and actual allocated resources for the videos.