Because no kid wants to eat liver? Kids meals are usually smaller and much more basic to cater to them. It would generally be considered a waste spending a $30 on a gourmet meal they probably won't enjoy. When I was a kid, eating out was a treat and adult meals didn't interest me, all I wanted was chicken nuggets with fries and sauce. I was always being encouraged to choose something more exotic but I guess i just had pretty bland taste buds like most kids. That being said kids can still choose the adult meals if they want.