The number fluctuates a lot, depending on where I look at it. I think it counts mods sometimes.
435 are in my "all games" dropdown, 159 installed.
And that dude with all those games is insane. I consider myself a steam game collector at this point, yet I'm having a really hard time finding games I want to add to my collection. There's been a few friends who have wanted me to gift them a game because they can't buy anything at that moment, with the promise to pay be back with the game of my choice. I can't do that anymore because there just aren't enough games out there to ask them to buy for me.
EDIT:
You own 397 games worth: $4,370.97 USD - What does this number mean?
If you bought all these games on sale it would have cost: $1,277.07 USD
You spend an average of $11.01 USD ($3.22 USD) per game.
I'm feeling pretty good about those stats. I know I didn't buy every game on sale, but
Member Since: October 17, 2007
Member for: ~59 months
$74.08 USD ($21.65 USD) per month
I'm happy with that rate per month. I know it's a little higher than that because I will buy gifts of really good multiplayer games so I can have someone to play with, but $21 per month is a cost I can afford. Factor in my $1000 TV and $1000 PC that both have lasted me 3 years so far without any sign of stopping, I feel my gaming hobby isn't costing me much at all. Not compared to other hobbies for sure.