Airbnb's commercial hosts are, in effect, taking hundreds of rental units off the market and putting upward pressure on rents. Airbnb's commercial hosts are, in effect, taking hundreds of rental units off the market and putting upward pressure on rents. UPDATED: 9:00 p.m., Oct. 14: Airbnb and other short-term rental services straddle a fine line between the so-called âsharing economy,â characterized b