How can supply and demand work if you are the sole supplier for expansion items? By restricting the expansion items one would get, you are effectively creating such a high demand and therefore it is those items that all players complain about. If I get 15 mins break to spend on the game and I spend 90% of the time visiting GTHQ just trying to look for a particular item, the fun part of the game is lost. I am sure there are many people like me who value the work that goes into this and do not mind spending real money on it but at present it is a bug and you have to admit it instead of passing it around.
You have the information of how many failed attempts was made and what item was intended and based on that why not increase the probability of getting those expansion items from the bubble hit?