I know what I would choose, too, but I have an income. The target for such schemes is people who don't have that, or have a really low one. For them, the options look like "about what I get now, and I can choose my own working hours, and no longer have to listen to a boss" and "bingo".

And that likely is true. If you choose any 20 hours to work each day, 7 days a week and have some talent for sales, you likely will make that 15K.