Stickers/decals are a relatively inexpensive medium for artists to distribute their artwork on.
Sticker artists often trade their work with each other in order to expand distribution. An artist’s stickers may be distributed worldwide and end up adhered in places they themselves have never been to.
Decals are also great for the artist who wants to brand other objects with their artwork. A decal can be placed on wine glasses, mirrors and most any other hard surface their heart desires.