Systems and methods are provided for receiving a first message associated with a first sponsor and a second message associated with a second sponsor for inclusion in a message collection. The systems and methods determine a first priority parameter associated with the first message based on sponsored content, and a second priority parameter associated with the second message based on sponsored content. Based on a determination that there is insufficient message inventory to include both the first message and the second message in the message collection, the systems and methods prioritize the first message associated with the first sponsor in the message collection and excluding the second message associated with the second sponsor in the message collection, based on an amount of consideration associated with the first priority parameter received from the first sponsor and an amount of consideration associated with the second priority parameter received from the second sponsor.