OTA's have their place in the business of short term rentals, just as much sometimes as a realtor or other property manager may in your business. What is your goal for marketing without an OTA? One property that I currently manage uses a property management platform that includes Airbnb as one of the marketing channels, which we do not use simply because it attracts a different type of guest than we are seeking, but may be useful to your business. Using a platform similar allows you to build a database of clients to re-market to, but also allows you the time to create the best experience you can to your guest. Learn their interest and make it easy for them to interact with your social media will help you develop a more targeted market to advertise to and help lower costs. Airbnb is a tool that you can use to help make your business viable. Once you develop a client base you can market directly to your targets, showcase the experience you are offering and even monetize add on services. A profitable short term rental business is a long term investment, it can take years to get to the level of income you expect, why not use tools to shorten that period.