> A study is not needed to demonstrate that not following the scientific method lessens the usage of the scientific method
Again, you're treating this as a given when it is anything but. Sure, pseudoscience means you're not doing science, but people promoting pseudoscience weren't necessarily going to being doing science instead / the people listening to them wouldn't necessarily be listening to science instead. In other words, science and pseudoscience are not a zero-sum game. In fact, the existence / publication of pseudoscience could actually galvanize "real" scientists to do more work than they otherwise would've to prove things scientifically. Not saying this is the case, but again, your assertion is far from a given.
Also, although we like to pretend that "science" is some concrete ideal, it is really not. For example, I mainly consider things to be scientific in line with Karl Popper's thinking re: falsifiability, which would cause me to lump a lot of "science" done today in the "not super sciency" category alongside some of the more clearly bunk pseudoscience.