When people see that they can build their own vertical wind turbine they may set out on a mission to prove the company wrong.  This theory has boggled the minds of many people especially those who have paid the thousands upon thousands of dollars to have them installed to provide electricity for their homes so that they can live off grid.  We spent thousands of dollars you will end up having to run the turbine for 20 to 25 years before you can see a return on your investment.  However, these wind turbines can be built yourself around $200 and will work just as well.