I had only one reason to not take this "insane" deal... but the reason with good timing.
I have joined Sonar when it was possible to jump from 8.5 LE into X1 Pro for "insane" price. And now I see how and where that is ended. I understand that "this can not happened with Magix" argument, but... I read that SF was sold to it and still delivered as 32bit, the interface is a bit "old style" and other similarities.
It could be "just a bug" in the shop software, thought to be just as an upgrade for limited audience. But it is now published all over the web and still there. Something keep me from taking such "insane" deals.