Heyyo,
Well, dude, you only need steam to be installed once to authenticate your cd key, n' copy of HL2. After that, you can get rid of steam.
But I also heard rumors while playing some CS: Source, that let's say you bought just the bronze package, n' you wanted to play HL1: Source, you'd need to actually PAY to download it! Harsh eh? So yeah, TWrecks, you're entirely right aboot Steam, it's a big marketing ploy... n' I hate it even more every time I learn more aboot how deep the rabbit hole goes. (Heh, steam is like the matrix.. Full of secrets, n' ploys
)
But this may be just rumors, so maybe it's the truth? oh well, only time will tell I guess... BTW, if you preloaded your copies of HL2 n' stuff on steam, you can dl CS: Source, the retail version n' play it now. So that's pretty cool, but how "conveinient" that they're holding back the retail versions of the game until this little quarrel between sierra n' vivenda is sovled eh? So us people who wanna buy the boxed versions have to wait something like, 1-2 months maybe... also maybe just rumors... I think.....