That and S.T.A.L.K.E.R. Clear Sky which were the first games that forced me to use Steam. Was terrible back then, but I prefer Steam at the present. 

I refused to buy HL2 when it came out because of the Steam requirement, and I avoided Steam for a long time. I guess eventually there was something I really wanted to play that was Steam only and made an account. That was sometime before 2010 I think, I don't remember for sure. I finally did buy HL2 but I got it on sale for cheap. I've never bought anything there at full price. The most I've ever paid on Steam was $24 for Tomb Raider 2013. 

It would take you...
16006 continuous hours
1 year,301 days,22 hours,58 minutes
of gameplay to complete your Steam library

$33687
Current account value

Thank God for bundles... ;) 

http://imgur.com/5LyAqF8

column one - actual cost
column two - cost per hour
column three - amount of time played 

My steam login name is "steamcansuckmyarse" which I guess reflects how I felt about it when it first appeared. That was before shit like Origin so I kinda feel happy with steam now ;)