Well, this would follow the BGE model of charging a high price point for the grill itself, then nickel and diming you for every accessory they can. This is definitely another sign that this grill is a direct competitor to the BGE and not necessarily targeted to typical Weber guys. Just my opinion.
You didn't ask me, but I'll give you some input anyway. Lol. My huge concern with the ceramic kamado grills are that they crack. Secondly, from what I've heard from people that have used them, while one of the advantages is that the ceramic holds heat so well, but to me all that really translates to is I would use less charcoal. That isn't anywhere near a good enough reason to spend that kind of money. And, if you overshoot the temp it is very difficult to get the temp back down. The Summit is marketed as far more workable since it's double walled metal (imagine a Yeti type tumbler), so it has the heat retention benefits, but also can be cooled down easier and won't crack like the ceramic.
But, here's what I keep coming back to. What can a $1000 Summit Charcoal or $1200+ BGE do that a Weber Kettle (~$100) and a 18 WSM (~$300) combo can't do? In fact, a case can be made that the Kettle alone can do everything a kamado can do.
I think the kamado grills are a bit of a marketing deal. They are big, shiny, and distinctively colored. Just looking at them, they are pretty. And, I can see the appeal for people that want to jump into charcoal and when they spend all that money and get the shiny, heavy grill they kind of feel like they made a good investment.
But, it all leads back to my question of why Weber is getting into the kamado market at all. I've said it since they first announced the Summit Charcoal. They aren't going to turn any of the cult-like BGE owners, and typical Weber owners aren't jumping in to get the Summit Charcoal grills, clearly. I've always said they would be far better off making a double walled Kettle, in a variety of colors, with the diffuser they sell in other markets. Slap a $400 price tag on it and you'll sell a bunch of those bad boys.