Sometimes you might encounter cosmetic sales or clothing sales person at the counter - attending to the people who 'looks affordable' on the goods they sell.

But whatever it is, they should attend to whoever that approached them.

This is what they are paid for (the job).

So for those who look down on the people who 'have the poor look', sorry, you are paid for the service, please attend any customer that approaches you.

Two tips for them:
1) If your service is good, the customer will most likely to spread the good words and bring in potential customer for you
2) Rich people do not necessarily 'look rich' - they often say that they are poor - if you could get their trust, your reward will be more than what you see.