Hi @Andrew59, A company called learnairbnb (.com) did a survey of US airbnb hosts at the end of 2015 and according to the data they gathered, superhosts earn 2x non-superhosts (on average). This is accomplished through either higher occupancy or higher prices, not by having multiple listings.
According to airbnb:
"On your listing, your response rate is based on the responses you send within 24 hours to the reservation requests and booking inquiries you’ve received in the past 30 days. The response rate in the Superhost section of your dashboard is based on the responses you send within 24 hours to the reservation requests and booking inquiries you've received in the past 365 days."
To improve your "superhost" calculated response rate you could respond quickly to lots of inquiries, not just booking requests. So, you could "game the system" by asking your friends and family to each make an inquiry.
Having said all that, I agree with @Clare0 that most potential guests are interested in other criteria. However, a friend who uses airbnb frequently told me that she filters her searches to only display superhost properties.