Yeah I usually buy 20... x) But as I have lots of PP and it’s gonna be helpful for when the discount ends... I went wild x)
I just tried to buy 12 and then remembered the half price event was going on, so I ended up buying 24 instead.
20 Pokeballs, which brings me to around 57. That number still makes me uncomfortable and I feel like I should have around 70 or 80 Pokeballs to be on the safe side (because legendaries).