Over the years we have increased our hosting rate to match that of the market. From time to time we receive requests from past guests to whom we'd like to extend the same rate they had paid prior or, at least, give them a additional discount on our present rate, as a thank you gesture.
However, the existing pricing model only allows for weekly or monthly discount rates. I realise that through the email exchange guests and hosts can revise pricing, but haggling over price isn't something everyone finds comfortable. Airbnb should provide a means for hosts to extend various discount incentives, such as discounts for returning guests for example, right on the search page or upon selecting a property.
Just a thought...