Its a method used and proffered by some to distract from the real objective of punting, SELECTING WINNERS. 
If you get 50% winners it’s fine if they are all priced 2/1 or more but not so good if they are all priced 1/2 or less.
I note two similar threads are on the go at present regarding this subject, and from past experience they tend to be ‘light the blue touch paper and retire’ territory!
Rob