If I'm not wrong kik points were used to unlock new themes and smiles but kik stopped that and now everything is available for free. If kin is implemented, Do you really think people would pay for just stickers? I don't think so.
That's correct. Kik Points was used to unlock new themes and smiles. Kin will also be used for the same purpose. However, they'll allow users to create their own themes and stickers to sell on the market. So instead of just Kik creating everything, the users will also be able to contribute. So if you create a great theme, and I want to use it in my chat group, I can go buy your theme with Kin and you will be paid the Kin. So the themes and smiles will turn into a consumer to consumer marketplace where you can earn and spend Kin. Also, they have plans for additional features that Kik Points was never used for.
I would watch this live presentation/demo of how Kin will be integrated into Kik. This will be way better and explaining how it will work.
https://medium.com/kinfoundation/kin-ambassadors-event-2018-kiks-product-team-on-integrating-kin-recap-3-c1c4580478c5