I played at PokerStars a lot during the poker Boom of 2003-2006. Every time I was there there was a minimum of 100,000 players online and at their peak in 2009 they reached over 300,000 players online. As you can see below currently there are 12,747 players online. Almost 90% shave from when I played in mid 2000s and almost 97% shave from their peak in 2009. Why has online poker cliff dived so much?