You meet rich people and you hang around with them, and one night they've had a few drinks and they say 'I'll buy it!' Then they tell their friends, 'You must have this person's work, darling,' and that's all you need. That's all it takes. Get it?
And at the other end of the bar the world is full of the other type of person, who has a broken glass, or a glass that has been carelessly knocked over (usually by one of the people calling for a larger glass) or who had no glass at all, because he was at the back of the crowd and had failed to catch the barman's eye.