Do kids ebooks sell?

Do kids ebooks sell well? I don't know but I'm interested in your thoughts. I wonder if parents would let their child browse through amazon etc, unpatrolled as it were, to buy whatever they like at whatever cost? I don't think I would  have when my children were below a certain age. So are authors trying to appeal to parents? I suppose in a sense they always were when they published in print form, but clearly the experiences are different. You don't take a kid to a computer, kindle, tablet etc to spend their pocket or birthday money. It's hard to get your head round how it works and how it might work in the future. Any thoughts anyone?