Hello @ketcom,
you are right, I have opened every single orb which I have got from my mystery rewards but I got nothing really special, so I have not made big profit/loss with my orbs.
On my first 50 reward post I got a gfl corrupted pegasus and I mentioned it but this time i have got around 3 gold common cards and a few rare/epic ones so I calculated it with 2500 DEC - I think that was pretty the average from my orbs outcome this time.