First of all "cracking" any website is a crime...so I highly advise you do not go through that path...though you probably already know that.
I am not here to lecture anyone, however you could get into trouble doing that. It is way easier to simply spend a few dollars on the games you want to play, after all people spent time and money creating them so...
Well, Steam is a very big website and I am sure cracking it would be no easy job...apart from making those who do a hacker, or whatever they call these people.
Remember: cracking websites, whatever the reason is, is a crime!