As an experienced host myself, I know the value that professional photos add to a lisitng. Airbnb's own statistics show some interesting facts. Did you know:
When hosts tend to use professional photography there is a 40% increase in earnings.
Photos are one of the top reasons guests choose to book, with on average a 24% increase in bookings.
Many hosts are able to raise their nightly price after upgrading their photos by 26%.
Based on an average nighly price, you could pay for professional photography with just one night booked.