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You are proof that it is better that they buy mine than others. You have tried some of the cheaper junk
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I agree with you that many of the others zappers cost a lot for what they are and what they can do.
I have never tried one of your zapper yet but be sure that i will buy one when i have some cash to waste.
However, an electric signal with a specific waveform and a frequency is only that, there is no magical additional phenomenon that would make your zapper better than the others. Except if you have decided to use orgonite or a kind of antenna or a magnet.
Once again i repeat that i only comment objectively and critically from the information you post and the understanding i have and the experiments i have done. If you have some objective proofs or reasonable explanations that could improve this tech for the benefit of all humans, we are all listening.