Gamification

“Buy, buy, buy,” a bargoer shouted just after 6:30 on a recent Wednesday evening. He grabbed two shot glasses, vodka sluicing over his hands. The 411, a pub in London, usually sells about £3,000 worth of drinks (about $3,800) on a weeknight. But on another recent Wednesday, it brought in £18,300 — more than $23,000…