Gambling or Certainty?

Trivia titan Christian Drummond earns up to £60,000 a year - playing pub quiz machines.
The 40-year-old, from Brighton, Sussex, makes his living solely by playing the games in pubs, bars and nightclubs all over Britain.
Christian estimates he has visited well over 10,000 pubs, earning between £40 and £60 an hour, and tax free. (Mail)
You have to be impressed. What a general knowledge he must have!