Wrong. The moment i clicked purchase, i exchanged my currency for a commodity that i valued exactly to the amount of currency i payed for it. I was completely OK with exchanging my currency for the commodity, because, to me they were equally valuable.
Now though, Blizzard tells me that the currency i spent, actually bought me much less than i expected them to - and when the amount i spent is quite substantial, that becomes a serious problem to me. I do no longer value the commodity equal to the amount i have spent, because the commodity has changed - I was not informed that it would change, it just did change. In essence, this change has left me feeling scammed. I did not feel scammed before, i spent the currency with eyes open - knowing full well that others dont see the same value in it that i do.
Again, I want to stress. I do welcome the new cycling. Cycling is good for a fresh and healthy meta. As said otherwise changing the cards would have been one way. They chose different. So its also not obvious that this would have happened.
I will edit the initial post later on to collect some great arguments and feedback. Keep up the work. If you have twitter. Why don't you comment with #goldennaxx to show blizzard we do not agree with their decision.