What is your Main Reason(s) to Open Steam Account?

I got CS:Source short after launch as a part of payment for a project I did, together with Red Orchestra, HL2 and some other steam games (there weren't many of them back then). I didn't use it much until I got The Orange Box and I got sucked into Team Fortress 2 (it was much more fun those days than today). Soon steam became one of my always-running apps.

For Dota 2, to finally play online, to stop pirating games, and now, to trade :)

I got it because my friends wanted me to play Dota 2 with them. Ended up surprising myself by liking it. (Steam)

Because HL2 and the orange box required it. I rolled my eyes at the thought of another random launcher program, but it turned out to be awesome~

My brother gave me NBA 2k9 on my birthday, and I was forced to activate it on Steam. Then i saw it "Play anything without any CDs", discounts etc. Heaven for all kinds od gamers. Now i don't even imagine playing a game with a CDs. :D

First steam account: CS:CZ
other steam account(s): there was a surge of phishing and lost accounts at the time (way more than there is now) so I created a new account whenever the other one reached a certain value in games owned, now I don't worry due to steamguard and common sense

I created my Steam acc for the Portal Giveaway back in 2010. It was free for a limited time, so I was like: Why not? And now 4 years later, I have 124 games in my account. Not bad :P

was given css + hl2dm, was real fun with 20 fps and 640x480

Watching Music and Listening to Movies..

Same, Dota 2.

I got a Steam account after I got a retail version of Killing Floor for my 19th birthday.

I saw somewhere that you could get Portal 1/2 for 66% off. I was like "66% off! What a great deal!" How naive I was (relatively speaking).

no idea what drove me 9 years ago ;)

I opened mine for Spiral Knights. I didn't get any paid for games until my account was over a year old.

I like your "story" too

cs: source

Half-Life 1 and Counter-Strike :)

Playing dotA for years and when Valve bought it I had to get steam. :D

Don't remember. ;(

Steam was mandatory for playing CS when steam came out of beta.

humble bundle 3, but even then I didnt add a single game to my account for over a year after I signed up, not even the bundle I signed up for.

To play games. And because my friend told me TF2 was free.

Dark Messiah of Might and Magic. Than my account was one year collecting dust until I needed it again for Modern Warfare. Since then I started to use Steam regulary and now its my main tool to manage my games.

Games, games and more discounts. Also TF2!

It started off with TF2 :-)