Buying rounds

A leader in The Times today mentions the unfortunate Japanese Foreign Minister seemingly drunk at a meeting of G7 and goes on to point out that some of the great people have liked to take a jar (or two, or three....). Churchill is of course mentioned - "I have taken more out of alcohol than alcohol has taken out of me" - as well as Rabelais - "I drink no more than a sponge". Then it points to those others who did not indulge: Hitler, Khomeine, Osama bin Laden, none of whom "had a reputation for getting their round in."
I have known quite a few people who were reluctant to buy a round of drinks. One such did everything he could to avoid buying his round. He would let you go into the pub first, linger at the door while you got to the bar and bought a round. Then someone else in the group would buy a round. When it came to his turn it would be too late ("must get back lads"). Another day you'd get to the door first, open it and let him in first. He'd go straight to the toilet. He was up to every ruse known to the con man.
Earlier in life when I was a smoker I came across a few smokers who never seemed to have a full packet in their pockets. You'd share your packet with the group you were with and most of them would reciprocate. Not the wily one; when it came to his turn he'd produce a packet from his pocket with one cigarette in it. And he did it all the time! Why didn't someone tell him, accuse him, give him one on the jaw? Because this sort of bloke has a kind of innocence you don't like to offend.
One day - I remember it well - we were, about ten of us, sitting playing cards when he, the one who always had a packet of one cigarette, mistakenly pulled out the wrong packet (we didn't realise it until then that he always carried two packets with him). This "wrong packet" contained the most expensive cigarettes (Passing Cloud if I recall correctly). Everybody took one. I saw one of the party who never smoked take one. We all sat there playing cards in a cloud of smoke while he, the wily one, must have felt like crying.