Question

why could all people not wear khadi that wa introduced by gandhiji​

Answer 1

because khadi was not so cheap so everyone cant use it

Answer 2

Most importantly, consumer culture can be broadly defined as a culture where social activities, status, values are also centered on the consumption of goods and services.  

Apart from that the consumer culture is also considered as a large part of what you do, as well as what you value and how you are defined revolves around your consumption of stuff.