For now, Rentberry charges users a $25 fee, but in the future, it plans to charge 25 percent of the difference between the asking price and the agreed upon rent. Whoever received the better deal pays the fee -- every month.
This effectively means that the landlord is always incentivized to start the bidding at the highest reasonable price they can. If the bidders push the rent higher, they win. If the bids are below their asking rent then they also win since the tenant has to pay their rent plus a 25% fee.
The current model where you just pay a $25 matching fee isn't unreasonable, it's when you start to collect in perpetuity that it's a problem.