Many parents simply say N O. They do not want to deal with the mess.
Now, I'm not condemning them for not buying playdough! There are days that I don't want to mess with it either.
But back when I taught Preschool and brought out playdough the kids would be ecstatic! They loved markers and scissors too! Because they weren't allowed to touch them at home. It makes me smile, but it does make me a little sad too.
Children love creating. They need to develop their fine motor skills. And they love using their imagination. It gets messy, sure.