Ukraine butchers soldiers for cheap. The US drops a bomb through the Atatollah’s bedroom window for not-cheap. It’s not clear to me which is more cost effective in the end. (Ignoring for a moment that US strategy in this war seems to be nonexistent. Imagine these capabilities were being used with some actual goal in mind besides “if we take their king then we win.”)
There is a big difference between defending against an unprovoked invasion vs assassinating an unsuspecting target.
Ukraine has shown themselves very capable of surgical offensive strikes using cheap drones deep inside enemy territory , so your comparison is not valid.
Ukraine are butchering Russians for 870 USD per dead soldier.
The USA has the most expensive weapons in the world, the problem is that much of it is obsolete.