Remember when the common knowledge was that war was good for the economy?
Rule of Acquisition number 35: Peace is good for business.
Really wish I had a better memory so I could memorize these as a lot of them would be really fun as everyday quips.
That said, the patriot is a lot cheaper replace than the things it was defending so it was a good investment even if expensive.
We know Ukraine is working on a not a patriot interceptor that can do ballistic missiles, but so far there is no word on progress. (this seems to be intentional - they are not saying why but experts have some good guesses)
Losing at war is universally bad. And long stalemated forever wars can be just as bad for both sides.