iPhone's battery deteriorates to a point of not being able to sustain ideal usage after mere 1-1.5 years. That is a very bad case as per mobile phone standards.

iPhone's battery deteriorates to a point of not being able to sustain ideal usage after mere 1-1.5 years. That is a very bad case as per mobile phone standards. $1000 for 18 months averages to about $56 a month after which your phone will start deteriorating to a point of being not usable anymore. Not acceptable no matter how valid their argument is.