@Alexa3990 If they feel comfortable with the rentals they get, why would you want to try to convince them to list on Airbnb? And if they don't have time to put up a listing, how will they have time to deal with yet another platform and more guests?
Personally, I wouldn't try to get anyone I knew and liked to list on Airbnb, as their attitude towards hosts has become horrible, and their customer service is horrendous.
But to answer your question, yes, there are referral bonuses- you can search for the info on the Airbnb main site.