User blog comment:Pgrobban/The rise and fall of Cookie Run/@comment-24956068-20151002102429/@comment-26044650-20151002151939

''With the current condition where there are more than 30 S-grade pets and new cookies with very high requirement, the game environment is very not hospitable for new players. Some unpopular S-grade treasures need to be retired (or creating a way so they will get preferred S-grade treasure easily), some older releases should be buffed, and cheaper price for buying/upgrading so new players don't feel exhausted of endless coin farming. ''

You have to understand that they need to make it interesting for long-time players as well. If they decide to release non-S Cookies or pets, they will think it's not worth it and/or it's an insult because at that point they are so much inferior compared to the S ones. They are also increasing the requirements for the S Cookies BECAUSE they want you to either play the game a lot, or spend money on Crystals to unlock them. It's just basic "IAP-Ecomonics".

And, honestly, can you really think of any ability that would be compitable to its non-S variants? All the "passives" are already covered with the C/B/A Cookies and pets. They'd have to "mix and match" but they would potentially enter the S variant which makes it pointless.

The same applies with treasures.