I can sum up why reputable dealers get away with selling LRL devices in two words. IT SELLS! As long as people are willing to buy this crap, dealers will sell it, it's just that simple. Here's a little experiment I did once. I borrowed an anderson rod from a friend and I made another one from a bent wire stuck through a copper handle. Went out in the field with no electric lines around, fences, etc. I began swinging the 'A' rod and it hung up at a certain point. I used the homemade one and it hung up at the same point. I then took a metal detector and scanned the spot and sure enough, I dug up a rusted can! Well, so much for the gold bait chamber and descrimination!LOL These companies have made and continuing to make a lot of money off this stuff. Amazing, isn't it?