If I have wiggle room, I make my max inclusive of the "x% more if it catches my fancy". It's unintuitive to search for "max $680k" to ensure results are within a $750k budget. As someone who uses real estate sites, this is enough friction to send me elsewhere, where, as tamana says, my preferences and ability are respected. Why not add a slider bar for "perfect place" wiggle room amount/percentage, with a 10% default, but which the user can set to zero?