[andre2907]

Originally Posted by devilayu

There actually are a couple singles on the charts hitting it big:
"Seishun Amigo" by Shuji & Akira (units sold for each week, this is NOT a cumulative unit sale)
Week 1 = 115,000 (debut #1)
Week 2 = ?
Week 3 = 250,108
Week 4 = 174,788
Week 5 = 114,034
Week 6 = 82,368
Week 7 = 61,243

"Konayuki" by Remioromen
Week 1 = 93,484 (debut #4)
Week 2 = 80,023
Week 3 = 81,562
Week 4 = 70,847

"Triangle" by SMAP
Week 1 = 181,908 (debut #1)
Week 2 = 45,538
Week 3 = 22,338

"supernova/karma" by Bump of Chicken
Week 1 = 161,022 (debut #2)
Week 2 = 35,908
Week 3 = 18,267

So although it's predictable that the sales will drop off the weeks following debut, Shuji & Akira and Remioromen are doing very well on the charts. The numbers all depend on who debuts on a certain week and also who the performer is. As you can see, the male groups are the ones who consistently sell incredibly well, breaking into 6 figures their debut week.
Singles still sell well but I think there's a lot more market competition, so it's rarer to see really big sales. From what I've seen, looks like "Seishun Amigo" might be a million seller.
[all stats taken directly from the Oricon site]

But this charts are from ONE WEEK in 2000. While Seishun no Amigo numbers are impressive, the others arent, I mean, the 7th position was selling more than SMAP 'Triangle'.