The wikipedia says their career album sales are about 80 million. What are the band's own numbers? The real reason is that I want to know the real sales figure for the Number of the Beast so that I can scare the hell out of people.
I've never been able to figure out the exact amounts - I've seen the band list anywhere from 70 to 100 million. Sales are a bit confusing because you get certifications based on albums shipped and not necessarily albums sold, and then you have Soundscan tracking, which didn't go into effect until 1991...so any sales pre-1991 aren't overly accurate. I also don't know if they're throwing in live album/singles/DVD sales as well.
I've seen TNOTB listed anywhere from 2.5 million to 4 million worldwide.
Is the quoted 80/90 million, album sales or unit sales? As unit sales could include singles as well.