As per my knowledge it is not trust but the services offered. I can put it like discount brokers are like self servicing restaurants, you come, pay and go fetch your food by yourself, based on rush you may get place to sit and if not eat standing and once done you need to go to wash basis to clean your hands and leave unlike in service restaurants, where you will be pampered and everything is bought to your desk. I can say it is same quality of food and tastes better only difference is services you get. There will be no RM, one brokerage plan for all, just one support system for all, no detailed/ research reports are provided( not sure if those research reports are any good) etc. Hope you got it what I am trying to say.
Also PMS requirement is just 50 lakhs and it is big but not like a super big amount these days, we ourselves have many clients who trade by themselves with much more than 50 lakhs.