Its because there is constant news from Sony with a stream of games ect announced or launching.
Xbox One has game droughts, esp this time of the year (or it just seems that way).
Nintendo? well tons and tons of NX threads.
Number of days to reach 50M from 40M : 198 days
Number of days to reach 60M from 50M : 187 days
Number of days to reach 70M from 60M : 175 days
Number of days to reach 80M from 70M : 227 days
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249