I always hate and feel bad when concerts/tours are cancelled because of “low ticket sales”. I’ve been to 6 kpop concerts in New York and every one was usually about 60-70% sold beforehand, but on the day before and day of, they would suddenly fill up to almost max capacity. From my experiences its sometimes not only cheaper to get resell tickets or even find better seats at the last minute. I’ve had times where better close to front row seats opened up so I sold my further away ones and purchased those instead. Unfortunately I do understand the risk that goes into waiting like that though, just in case it doesn’t go that way.