The attitude that Clojure is only for some enlightened few who are worthy enough to understand it is extremely alienating. Lisps aren't that hard, homoiconicity isn't that opaque, the benefits of using Clojure can be explained in practical terms that most developers can understand, if not at first be convinced by. All these concepts can be explained succinctly in text.

Saying that Clojure is only for those who share some 'vision' is hand-wavy at best, insulting at worst.

Edit: My guess is that Datomic is targeted towards Clojure devs because they are already experienced with Datomic's philosophy and will understand the system better. It also provides a smaller and highly receptive market. They can then focus on perfecting the software instead of training a large number of people in the philosophy behind Clojure and Datomic.