I think the issue is not the $5.
On business trips one is always running out of time. Making time to be able to eat something can be a challenge.
A 2 hour flight can mean 5 hours travel time, which, personally, is a long time with an empty stomach.
An expected F meal saves time and gives me piece of mind I won't starve before getting home.

I know there is Starbucks and CPK at the airport, I know there are cafes on the first floor of the building where my meeting is at, but sometimes there is just no time.