What's wrong with instant book?
First off, Airbnb has an auto set so that guests dont't have to adjust the number of people. I am constantly getting requests for 1 guest, but I catch it with the back and forth. I'd miss this with instantl book. If you charge extra for guests, expect them to entire 1 guest and have more than one show up with instant book.
For me..it is finding a good match with guests. Not everyone is renting an apartment. I rent sailboats that guests sleep on. They must kayak to get to them. There are some real safety issues and concerns I have to discuss with them. Can they swim? Do they know how to kayak? My listing is practically the Amazing Race and most guests don't read with INstant /
I have noticed that Airbnb just changed guest requirements if you don't use instant book. We used to be able to set them. Not anymore. Forget about safety- all they need is an email verification. Profile photo? ID? Nope. Only with Instant book.