If I have extra space in my home, why wouldn't I just Airbnb it out? The guest can work there if they want, sure. But I doubt they want to pay as much as someone on holiday.
2) I think the price point is much lower and definitely depends on a different set of criteria like WiFi speed, quietness, privacy etc.
3) People might not want the hassle of an overnight guest, but would prefer an extra person just during working hours.