I absolutely admire Victoria Coren. However, after listening to a radio programme today and assuming that what I heard was correct - certainly no-one contradicted it - I felt very uncomfortable about the idea that a very large amount of winnings at gambling come from the losses of addicted gamblers and foolish people in desperate debt who are losing large sums, and among all addictions this one carries the highest tendency toward suicide. Yes, it's their choice; no, no-one forces gamblers to gamble, no-one forces someone desperately in debt to try to get out of it through the easy fix of money on a horse or whatever. Nonetheless, that's apparently the source of the income of sensible professional gamblers. (A small proportion also comes from the losses of recreational gamblers who are losing sums they can afford.)
On the other hand, everyone's got to make a living - some people work in banks because that's where they managed to get a job, some people work in retail in shops that buy from questionable labour markets - I suppose no-one's hands are clean, including mine....