One more concrete example to show the worthlessness of water cooling. Is the danger of leaking destroying thounsands of dollars worth reduction of couple degrees?
Just because some people don't know how to properly setup a water cooling system doesn't mean that water cooling is worthless. Are you stating this through personal experience?
I setup my first water cooling rig a few months ago and am currently running a lot cooler than I ever did with air coolers (eg. I was using the Swiftech MCX775-V before I switched to water) Just to give you an idea here are a comparison of temps before and after water cooling:
CPU on AIR: 32°C @ idle / 52°C @ full load
CPU on H20: 23°C @ idle / 32°C @ full load
GPU on AIR: 38°C @ idle / 58°C @ full load
GPU on H20: 32°C @ idle / 39°C @ full load
I think anybody would agree that this kind of temperature drop is definitely worth the trouble of water cooling, and besides, installing a water cooling setup can be a whole lot of fun and if done right, leaks are a non-issue. Oh, and as a bonus, my system is quieter than ever before, no more noisy CPU and GPU fans.
So I say, don't knock it until you try it