Seems manipulative design to me.<p>Yellow stars are already used heavily in apps for ratings, favoriting, marking as important. And previously as stickers of approval on your childhood homework.<p>In the example animation of purchases, note all the exciting confetti and sunburst reward-like animations... for spending money.<p>Not only are they introducing a level of indirection over money (you're not spending real money, but some fun imaginary thing), but they're also appropriating and misusing a popular favorable symbol.<p>Just show what these things cost in familiar real money (or at least make it a stylized gold coin already), stop preying upon children, and stop manipulating adults.