If this is an actual spy object you also need to factor in the cost of the surveillance. How much money does the military lose due to the sensitive information being lost. Or how much does the military need to spend to regain strategic advantage? That probably costs more than a F22 flight and a missile.
Obviously this depends on the number of objects that one needs to respond to. Cheap surveillance devices can obviously overwhelm this and then you have a war of attrition.
In the example of the article we need to consider the cost of flights being downed (which they down when considering the cost of hitting an object and downing an aircraft. Quite expensive). Flights being canceled and/or delayed is expensive.