I have NO BALLS!!!
This event should be called "We are taking your balls...all of em...especially your Ultras".
Answers
I play in areas where poke balls are easier to get than things to throw them at, and vise-versa. I adapt what I throw at accordingly to control the ratio of supply to expenditure. When I am in conserve mode, I skip mid-CP mon, use rare balls for mon that have high CP and might evolve into something useful. Otherwise, I just farm the low CP mon I encounter. In non-conserve mode, I throw at everything, and sometimes get lucky.
It doesn't make any sense. Dratini and Larvitar are much more rare than the starters yet are significantly easier to catch. This is further backed up by the main-series games. In the games, all pseudo-legendaries except the Beldum line have a catch rate of 45 (the exact same as the starters).
So either they should make starters easier to catch, Dratini and Larvitar harder to catch, or swap their catch rates to fit their rarity.
I've been throwing berries on swinub but everything under 350 gets a pokeball. Minimal Breakouts. I want the damn gold ice medal. I might get it. I've tripled my count since the event started. And I'm very pleasantly surprised with Sneasel. 5-10 a day was the most unexpected piece of this event. I'm close to the dark medal too.