How must it feel, as a business owner, to receive emails every day from companies promising you success?
For many, it mostly makes them curious about the methodology, moreso than about the vendor. So they don't necessarily respond. But many then turn to their Marketing Departments and ask, "Can you do this for me?"
The irony of doing things in-house is the higher level control is undermined by the lower level of competence.
So when you take a bad idea and try to implement it in-house, it's basically an act of self immolation.