They may have had genuine intentions in the beginning, I'm not one to say indefinitely what their true intentions were at that time, or even now.
But, when money and fame are a factor it changes people. It would take an exceptional human being NOT to be influenced by those things.
In my heart of hearts, I honestly believe that there was something in the house just not to that intensity as what was portrayed. Considering there was a brutal massacre that took place there, no denying that, who could rest knowing your older brother in which you loved and admired shot you in the back while you slept?
I just feel like there was a haunting (to a small degree) and with the history of this house it made the perfect ingredients for dollar signs and TV shows- FAME to pounce around in their heads! (not only the Warrens, but the Lutzs as well.)
just my thoughts.