There have been three or four periods in the past where I was losing a lot of golf balls so I convinced myself that like-new quality used balls were worth buying to save roughly 50% on the cost and minimizing the pain on the occasional horror round where I lose $20 or more worth of balls.
Both times it seemed great for a few weeks but eventually, after dozens of rounds I found there had been at least a couple balls out of a batch of 3 dozen that just weren't right. Well struck iron shots were substantially lower and shorter than normal distance, something about the way they reacted on wedge shots was weird and in a couple cases I could even hear a slight difference in impact sound/feel.
So I'm quite sure you're trading off a substantial cost savings for the likelihood that maybe one ball in ten will simply not perform like the others even though it is cosmetically perfect. That sort of thing drives me crazy so I will never do the used ball thing again but OTOH, my game nowadays has a lot fewer wild shots than back then (10 years ago maybe?) so it's not very often I'll lose multiple balls in one round.
I also did find that pretty much every large (3doz or more) batch will have at least one ball mixed in that is NOT cosmetically perfect. Sometimes more. If the price of the entire batch is cheap enough, I'm fine with having to toss out one random bad ball when it's obvious like that. What I can't take is the ones that look perfect but are actually bad. I really want to know that when I hit a bad shot it was me and not a problem with the golf ball or golf club.
In the end, I'd rather play a $30/dozen model of new golf ball instead of a used Pro V1. Or a new $15/dozen ball instead of a used $30/dozen model. I can deal with slightly lower performance that's consistent much better than uncertainty about whether each ball is OK. And nowadays there are plenty of affordable deals on balls that are quite decent quality, especially if you shop for sales and when necessary buy several dozen to get a price break.
For instance, if I could buy three dozen Maxfli Tour at Dick's instead of three dozen "Pristine" used Chrome Tour X for roughly the same price that would be a no-brainer for me. The new Maxfli every time.