Probably because they actually DO work, just never anywhere near as well as the makers claim. I see on their seasonal expected production map of the US, they do say my area is all the way down there near the 0L per day end of the scale in Winter. Which is about right, the air gets very dry here. Even this early, not even Winter yet. Over the Summer, the dehumidifier in my basement struggled to keep things below 50% RH, and required frequent emptying of the bucket. Right now, it's maintaining 35% and I haven;t emptied the bucket in 2 days. The bucket holds 11 pints, 5.2 liters. In Summer it filled up 2-2/12 times in a 24 hour period, so 13 liters of water. I don't know what the production is now, as I haven't let it fill up to see how many days it will day, but I doubt much more than 1 liter per day. And that's with the application of a LOT on energy to extract the water. 545 watts, for 23 hours (it automatically shuts down for 1 hour a day regardless of humidity) per the specifications.