What you experienced at this trade show is no different than any of the other myriad products salesmen peddle prior to a free chicken dinner. After the presentation, they will attempt to talk you into an annuity, life insurance, more insulation for your attic, water purifiers, lightning rods, solar panels, prepaid caskets and a match, solar tubes, garage door screens, home appliance warrantees, etc. All of these have one thing in common: to remove thousands of dollars from your checking account.
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