This is a huuuge step: Snapchat is selling reviews so users can replay snaps. This is interesting for 2 reasons: 1) With this function Snapchat gives up their success-model of NOT replaying whatever is sent to your palms. And 2) Snapchat asks you for money to see what a friend of yours has created and sent to you. For this usecase there are plenty of free chat apps out there. Use Whatsapp or Instagram instead. We wonder if Whatsapp simply introduces an option to define the amount of reviews. Problem solved :)
Not to mention that Snapchat is highly popular wirth kids who may not be willing/able to pay 30ct per review.