Exactly what I was saying in my last post... I think Real $$$ gets favoritism over earned ironite...
Another thing I noticed is when I spend Ironite I've earned in the game and use it towards souls / event souls, I end up with duplicate trash most of the time. But when I invest $99.00 in the store for Ironite, I end up pulling better characters that I didn't already have. Could be coincidence, but that hasn't been my experience...