Convenience would be the biggest. It's nice having access to my library of games no matter where I am without having to lug around a book full of CDs. All i need is my steam login and internet, and suddenly: oh hello all my games, how are you today?
It's also very nice not having to waste gas driving to gamestop (which is 20 miles away) to buy a new game when I can get it off steam, at home, and spend an hour or so downloading it. Same amount of time with less money spent for me.
It exposes me to titles I probably would have never heard about otherwise. Not every indie game is blessed with being minecraft and selling a million copies, its good to find the hidden gems and share them with people I know, and vice-versa.
edit: Also as CR said, the holiday sales are amazing. I must have bought 15 games last year for next to nothing.
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