@Elizabeth429, it may not be the Smart Pricing being on, but the low prices Smart Pricing sets that causes your listing to show more.
(Meaning, that if you set the same price yourself, your listing would show more.)
Lower priced listings will rank higher in the search results.
It isn't the magic of Smart Pricing... it is the just the way the AirBnB search ranking works
(along with people booking more quickly with lower pricing).
I'm not saying you should lower your price; I am just saying: don't think that turning on Smart Pricing is your only option for better search placement.