I didn't think I was talking down to you. I think we just have another case of internet makes out minor disagreements to be personal attacks and the like.
I just really don't like the $50k vs $500 argument and I've been wanting a chance on these forums to thrash it out for some time. Purchasing parity costs apply to a range of other potential conflicts: Israel vs Hamas, ADF vs TNI, etc. But of course the big thing is the potential damage an incoming shell can do. CRAM doesn't require every shell being fired by enemy arty (or other threats) to be intercepted just those that are going to cause a lot of damage.
I've been reading your posts for a long time now so take it from me that you can come across very abrupt and very quick to shut someone down. But back on topic.
You are correct in theory. However IDF is indirect by definition and Israel (and Australia) isn't fighting an enemy that is firing accurately. So Iron Drone is only set to react if the rocket trajectory is heading toward a built up area and that's still pretty random. Yes, a $500 round hitting something worth $100k+ is a problem, but the question is, how likely is that to happen. We can’t spend the money for worse case scenarios, just a balance between what is likely to happen and the cost of reducing the impact of it happening.
The problem in the CRAM area is that the technology simply isn't there yet, both at the radar level and the effector level. You've no doubt seen the troubles of getting a SM-3 to perform an exo atmospheric interception. Another problem is secondary fragmentation; laser systems suffer from this quite considerably essentially turning a super sonic sea skimming missile into 100 super sonic parts of frag, your problem is still there.
Kinetic solutions not so much, as I mentioned earlier Centurion suffers from the frag from the rounds it fires and others from the break up of the materials upon impact. The key is to have a high enough thermal impact to reduce the frag as much as possible and again, we still aren’t there yet with the technology.
It's all about the balance of probabilities. Against a modern military, it is quite easy to saturate your enemy with RAM, far beyond the capabilities of any CRAM system and cause massive devastation.
There are some interesting options emerging but as yet we need another 5 years of technology cycles to get us up to speed.