what do sticker star levels do?

[poobie]

What is the point of leveling up stickers to 5 stars? do they get more value or something? or is it just for collection purposes

[hyperfixd]

Every order you ship gives you experience points. You can see how much experience you get next to the star symbols at the top of the phone in the packing area. With these experience points your stickers are leveled up. All sticker elements that where part of the stickers you shipped that day will gain experience. Whenever a sticker element gets a new star, you gain hearts. The higher the level of the element, the more hearts you get.