This

+1

Good point. Plus, people often already own some of the games, especially with Humble bundles.

+1

Doesn't avoid the point of when Humble bundles several games to a single key, but in general terms, that's a lot more rational a consideration than 'Hey, win big! Sure you almost certainly won't want some of the games, but like I always say, "waste yes, want yes!" ''

I guess if bundles have the CV of the highest retail value game in them only, that'd be fair.

It's kinda a jerk move, in my personal opinion, after all, and it doesn't make sense the giveaway creator should get CV for something the recipient isn't verified to actually be able to utilize.

Counter-argument, it's not too different from current steam bundles, and even the more diverse of those seem to be handled fine.
Of course, those HAVE to be presented as bundled together, so that's a different situation.
Intentionally sabotaging how giveaways are presented is a bit awkward.

Moreover, what happens AFTER?
Since actual individual keys are being given, rather than a proper bundle, does the receiver get penalized for accepting a duplicate game? Do they get penalized for regifting?

No matter how you look at it, and irrespective of personal opinions on the matter, that just doesn't work with the site's system.

The reason steam bundles work is because 'nothing is left over', so there's no manipulation of the system. Everyone involved contemplates the gains and losses involved.

With a non-single-key bundle, it becomes... messy.

//

Of course, if SG added a full system for dealing with bundles [that I presume they don't have], that'd be different:
Have someone win a bundle.
Have them select which keys they want to accept [and are able to activate].
Have the giveaway creator receive CV for the activated keys only.

See, that'd work fine.

Be a bit of an effort to code in, of course.