If I discover that you are charging me high for patronizing you, because you want to sell low to people you consider poor I will stop patronizing you. If I decide to dress well doesn’t mean that I should be over charged for what I’m buying. If you want to run a charity home for the poor in your business, make it known to people so that any one who want to donate to that course will support willing. I didn’t steal the money you think I have. I worked hard for it. The government are holding the resources of the people. Such idea will crumble your business. I don’t think I can ever do that if I’m a business owner.
Not just you, I believe everybody will do the same, including me, because that's not equity. The mode of dressing can sometimes change individual's reality but it can never change their background and personality. Some poors also dress nicely, in fact, some wealthy people are even more humble than the poors. Without doing injustice, some businesses are still favourable to the poors, because when it comes to purchasing something or a commodity, poor people usually bargain, unlike some rich people they will just give you the exact same amount that is tag on the products without bargaining. OP don't have to stress himself about that, because they are shops that are made purposely for the riches and poor. So as an individual, you understand your financial status/ situation, so you will just go directly to where is favourable, and suitable for you.