Aha! So essentially, micropayments are less offensive to you. (Interesting because I feel exactly the opposite.) When you start dealing with more expensive products, it makes it harder to make bundles worth buying. Do you think anyone would buy the Orange Box if it was only a discount if you were going to buy all three games anyway?
Edit: I just had a thought. I have a feeling that if Valve had not listed HL2 and EP1 in the list of games, and instead said "also includes a coupon code for a free copy of HL2 + EP1" you guys wouldn't be complaining. If they had made it sound like an "optional" bonus, I really doubt you would take issue.
This is, actually, very true. So, it's valve's own fault that we've raised this issue; if the marketing team had been as on-the-ball as BiG_D is, they might've gotten away with it
I guess maybe they thought '5 whole games for $50' would sound more appealing than 'three whole games, plus HL2 + Ep.1 as an afterthought'. In a sense, though, HL2 would have to be part and parcel because Ep.1, 2, portal, tfc require HL2 to run (I think).