@ZipLine-- As far as I know, there is no charge to use a cell phone parking lot. I've used the ones in Los Angeles and Washington D.C. and neither had a fee. I think this applies to all US airports. But they do have a limited time frame, which is usually two hours.
The fact that it's free is actually the major reason why cars prefer to use the cell phone parking lot. That and finding a parking lot near the arrivals gate is a huge pain sometimes.
You just have to make sure that the person who's arriving calls you only when they're outside of the airport and ready to go. Because cars are not allowed to stall and wait, even for a few minutes in front of the airport in most cases.