I have not counted it for a long time, but I remember the statistics from my old poker room, as I watched it before closing this room. For 5 years of the game, I found about 250,000 hands played, this is about 50 thousand per year. But then I played really a lot of surprising the game for many hours in a row bringing myself to exhaustion. Now I play a little, maybe 1,000 hands a month, because I'm playing mostly freerolls and stopped playing one on one and do not go to the cash game.
But if you playing for money, the many hand="more money"
for example, if you play with strategy in plus per day for 10 dollar, per month it is 300 dollar. For increasing your earnings for example to 1000 dollar, you must play in your strategy in 3,3 times bigger than now.
Pro user have many hands because of that (for earn ... money).