Clarste already summed up pretty much everything I wanted to say, just one minor addition:
Mami was a VICTIM.
Kyubey forced her into the contract when she was dying and had no choice. So yes, while pitching the dangerous life she hated so much to two other girls was a pretty nasty and selfish thing to do, but with her backstory taken into account, it's understandable.
R.I.P.
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