SpaceX (among others) does a series of final automated checks 10 seconds before launch, and aborts the launch if any of them fail. Yesterday and today, one of them did (each time), causing the launch to be scrubbed for the day. (Today, it almost had to be scrubbed due to weather, but they were able to have the attempt at the end of the launch window). At the end of the webcast, they were sure to thank range support, the FAA, and all the others who worked to support the launch, which probably includes a lot of SpaceX engineers/managers as well as civilian and military authorities outside the company. Presumably, there is some significant cost to doing all this and then having an abort within the last 10 seconds. What is that cost?
It seems clear that the cost of a failed launch is much higher, but it'd be interesting to know the (approximate) number.
Answers should ideally be sourced, but do not have to be specific to SpaceX.