There is a certain skill level, which I want to say is somewhere around 1400 to 1500 but it has been over a decade so don't quote me on that, where most the players at that level seem to focus on memorizing openings. It ended up being what separates them from the players a one to two hundred points lower. This leaves them vulnerable to a bit of a hack, as using a non-standard opening can completely remove any usefulness of their memorized openings. It almost disorients them and makes it much more likely for them to make a mistake that can then overcome the disadvantage of such a non-standard opening. I loved playing in this area as I hated memorizing openings so I just used non-standard openings to not to avoid having to. Eventually I hit the ranking where players were good enough to take advantage of my non-standard opening more than any advantage from disorienting them and I quit playing because the only option to advance would've been to go back and memorize openings.