Right now we are looking at the effects of HIMARS rocket artillery in Ukraine. Each rocket costs over $50,000. Cruise missiles cost over $1 million. Many nations can produce rockets, but cannot produce them cheaply. Despite the US and Russia having global strike capabilities, this stuff doesn't come cheap. If they were cheap (say via continued investment in space exploration), you basically have a win button for any global conflict. There's literally no reason rocket artillery has to cost over 50 grand in the grand scheme of things. In a total war, we could probably get it down to less than $2000.