I apologize if someone else has already posted this, I looked and didn't see anything.
According to Simguru Lyndsay, the sims 4 has sold over 5m, while this was rumored a while ago, it is now officially confirmed.
for more information
"Interviewer: We have a non-official number that The Sims 4 has sold over 5 million copies worldwide. Is that correct?
Lyndsay Pearson: Yeah, it’s definitely somewhere over that! We don’t really track specific numbers but there are millions of players who are playing The Sims 4 and have seen this update."
At least we can now once and for all settle that sims 4 did not flop in it's sales. Discuss Politely.