Why Why Why Why Why no wireless???

I don’t get it. Why is it that every little Podunk airport I fly through (yesterday it was
Ft. Wayne IN) has wireless internet access in the airport, but many major commuter hubs (Washington National, Dulles, Chicago, etc.) do not. I realize that for the bigger airport they would need to invest in a number of access points to give wide coverage. But it wouldn’t be that expensive. How many years is it going to be before you can reliably connect while killing time in an airport?