For perspective: Patriot missiles cost $4m each.
Attrition compared to US materiel(not material - although that too greatly burdens cost to the US) depletion such as the aforementioned Patriot does not favor the US for sustained operations in theater(let alone should a second theater contingency operation occur).
As for the $40m number: I also saw this number, but I don't think it's correct. E.g. Germany recently bought 140 of them for $165m. Ref: https://www.i24news.tv/en/news/israel/defense/1649255166-ger...
You don't sacrifice pilots, ever.