I'm surprised that people seem to find it hard to believe there are people out there that can pay for work like this.
I have spent most of my working life in Central London, working on large period houses mainly in Kensington & Chelsea, and the money they have in this area is out of this world, the guys driving Range Rovers tend to be the poorer ones, people regularly spending 1,2,3 million pounds renovating a house, and then furnishing it with all the bells and whistles.
There is easily a constant supply of people with the money, and once someone has something made, and shows it to their friends, they want one, and so on. The money I see spent on these houses is outrageous, gold plated basins, guilding, anything and everything, they won't all be attracted to bespoke handmade furniture, but it wouldn't take many.
And when you think about it, people have quoted over 200 hrs for the corner seat, so if that was an average (ish) job timescale, plus design etc etc, means that you probably only need 7-8 jobs a year to mean you are working 50 weeks, which when you look at it, is not that much work to aquire.