Both William and Harry are mega cheap so this really doesn't come as a surprise. There are a number of stories about the both of them that are just flat out disgusting. I read they would go out with friends, hike up the bill to enormous sums, and then claim they had no money on them leaving their friends to pay the bill
The Queen is too notoriously cheap as well although people like to spin it as her being conservative and practical.
Many rich people are greedy. Just think of it that way: If you would always spent your money on holidays, drinks etc., you wouldn't be so rich. Better to live of others.
William's and Harry's behaviour is just disgusting.
If I would've been one of their friends
being left alone like this in a bar, I would've told the bar owner to just send the bill straight away to KP or Buckingham Palace.