Here's your official answer.
The 24 pack carton was designed for convenience and for on-the-go use. Those customers drinking Shakeology every day are advised to purchase the 30 day bag, which is also a better value. While we suggest that customers drink Shakeology DAILY for best results, we recognize that some do not. Those customers may prefer the 24 pack. We have found that many customers buy both the bag and the cartons, using the [portable] packettes as their lifestyle dictates.
Additionally, I think it's more expensive to produce the individual packs, but they wanted to keep the prices for the two options the same, so they adjusted accordingly.