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I am sorry that you have not been helped yet. I just came online and saw your question
Are these the plain Prius, or the C, PHV, or V editions?
I dont see any service bulletins offhand on brake wear issues, but if you would let me know which editions you have, I can dig deeper and see if there is any explanation for the pad wear
That wear rate is quicker than normal even for the Prius as they usually get around 80K to 100K miles on them before needing replacement. I have gone thru all the brake, hybrid and and other related service bulletins out by Toyota and none address any known issue causing this. I am going to open this up to other experts that may known something on the 2014 to be causing this type of pad wear