Make thousands of riyals a day from this scam. Shortage of coins my tail!!

If the government passed a law saying they must always deduct (Round the amount down - never up) you would see all the coins they need suddenly appear.

And as someone else mentioned - for the people who appear to be more affluent - they often offer NOTHING. Just close the draw and start on the next customer as if you don't care. If someone needs 50 durhams just ask me I will give you 5 riyals to help, but these big chains and their owners are much richer than you and I can even imagine. It is simply a form of institutionalize robbery.
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"A Wise Man knows what he does not know!"