The thing is, on joyofclojure.com, it says:

"[...]The Joy of Clojure can now be pre-ordered, which gives you access to the entire book as a PDF now, plus other formats including the printed book once they're available."

Which is misleading because you only get the pdf if it get pre-ordered FROM MANNING.

And, yes, you are right that I give a part of their profit to amazon, but I still give them money.

Maybe you are right that it is just "not nice" and not rage-worthy. Still, I don't like the idea of a company being "not nice" to someone giving them money.