Haven't read the interview yet, but we only do shops in the town we live in. Average time per shop is 10 to 15 minutes work, price about €1 a minute. Some are weekly, some 2 weekly, and a few monthly. Altogether, they're worth about €300 a month to us, and I see it as easy money. Some time ago, there was a huge mall opened about 30 miles from us and I canvassed about 7 or 8 shops in it, the prices were a lot lower at that time because everyone wanted to get in at the start. I sold that work after about a year though.
It's not just about price here, it's about reliability and quality. That's why most of the firms here don't have to work for low prices.