Evidently I'm in the minority but I find it nauseating. If you're at a party and there's free pizza, you don't spend your evening trying to eat as much pizza as possible. Take some, enjoy, and move on.
Different scenario. In the party, you're causing the other guests to lose out, and the generous hosts to shell out too much money due to your slovenliness.
In this case, he wrote that the other passengers weren't drinking, he 'paid' for his ticket, and the airline kept on offering it to him w/o him having to schnorr it.
Methinks you wish you could drink Dom as well.