I'm expecting jin to sell over 1.5m easily once all the shipments is done by December - January which is quite surprising cause he's one of the least popular member in BTS . So maknae line will double those sales especially jungkook and V, their China and Japan fanbase is huge! So I'm expecting jungkook n V to sell over 2.5m - 3m and jimin to sell over 2m - 2.5m easily!
Lol he is not least popular. He is only behind maknae line in popularity and on par with yoongi now a days.
Popularity wise their ranking is
Maknae line
Jhope and rm
Moreover many armys are ot7 who would support all members equally