The Worse the Practitioners’ Experience, the Higher Their Income; the Better the Experience, the Lower the Income

When it comes to providing personal services, driving is far more comfortable than being a salesperson; being a salesperson is far more comfortable than delivering takeout; delivering takeout is far more comfortable than being a live-in nanny; and being a nanny is far more comfortable than working as a foot massage technician. The more comfortable a job is, the more people are willing to do it.

So conversely, that means the supply... becomes larger.

If someone insists on making money with only an ID card in hand, what exactly are they earning? To put it bluntly, it's money from jobs others are unwilling to do. If everyone else is reluctant but you're willing, you'll earn more. Conversely, the more people are willing to do it and the greater the supply becomes, the less you'll earn.