A lot of folks like to DIY. Sure, you might not be able to beat the cost or form factor of a heater core, or the performance of a professionally designed and meticulously engineered specialty radiator. But often we eccentrics like to do things for our own reasons. Sometimes those reasons might be an indication of an untapped market, other times they are just wacky.
I doubt anyone is going to start marketing Galileo case or reservior thermometers just because I think they are neat, nor do I imagine there is a big demand for Archimedes Screw pumps. That won't stop eccentric and wacky folks from finding them nifty, or figuring out how to fit them into a system. On second thought, the Galileo thermometers could be marketable. I wouldn't hold my breath on the Archimedes screw pumps, though.
Looking through past forum posts about DIY radiators I see a lot of interest in passive and semi-passive setups, artistic setups, chimneyed setups, and a few things just really ghetto. Why would folks spend so much time, effort, and dollars on such things (often the parts alone from the local hardware shop are more than a heater core!)? Some folks just want something that is unique, some want the satisfaction of DIY, whatever.
Look at the blocks folks make. An argument could be made that there is no need for a block design forum. Most folks do not have the knowledge or the equipment to manufacture a reasonable waterblock. Waterblocks are commodity items, how are you as the hobbyist going to beat the performance of a Storm (let alone even a Swifty 6000) and the price of the Swifty 6000 series? Why bother?
The answer is because unlike you folks whose livelyhood and careers are firmly rooted in the intricacies of the business, and are pushing the envelopes in all directions, a lot of us just don't care as much as you do, at least not all the time. We'll use your components, and we greatly appreciate them and your efforts, and have the utmost respect for you. But damn it, sometimes we just want to do something wacky or unique. We know the odds of us doing it better than you are vanishingly small, but we don't care. Our inner child wants to be able to point and say "I made that!".
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