itch.io

That may be so, But price isn't decided by what a sprite is, it's decided by how much time it takes to create.  If I have to invest 15 hours in creating a character and 15 hours in creating a dice the price will be exactly the same. You may think that a character is more complicated but tweening software is used for characters, a dice animation requires each frame to be hand so it actually ends up taking more time.  Further more it's not just eight pngs. it's an animation, an editable gds file with free access to gds editor program, pngs for each  result, SVG,s  and of course a license that will let you use it in your commercial project without any further royalties.  How many people do you think there are in the world that need an animated dice? I have to wait years to get return on investment at this price.