House flipping may not be as popular as it was just a year ago, but for those willing to risk it, there are now record rewards. Four percent of home sales in the first quarter of this year were flips, according to RealtyTrac, which defines a flip as a home that is bought and sold again within a 12-month period. That comes to just 17,309 flips, which is the lowest share since the middle of 2011.

The average gross profit on a flip, however, soared to $72,450, up from $61,684 in the first quarter of 2014. That is the highest profit since this survey started in the beginning of 2011, and is attributable to tight supply in the housing market, which is pushing prices higher faster.