I personally try not to enter any package gibs where the retail of the items I need is lower than the retail value of the package- in other words, if it's cheaper to get them separate, then going for the package is just being wasteful. I usually expect a similar mentality from people entering my gibs.
I do make rare expectations on both sides, though, for packages were a lot of the content has been super cheap or free, and the DLCs are tricky to get otherwise.

Like, if you're entering for a soundtrack DLC, that's not usually appropriate, but if you're entering for a package that includes the base game and an expansion of similar retail value, and the base game has been free, then I may lean toward allowing it.

X-Com is a good example of that- at $41/49.99, I'd usually not enter for DLCs alone, but given the state of the base game and that I'm unlikely to be able to get the DLCs otherwise [they don't generally go on sale- the complete pack actually has gone further on sale, and more often than they have], I make an exception for it. :)

Well, I tend to be more precise about those kind of things than most people :P
A lot of giveaway creators use more of a generalized 'as long as you don't own most of the content / any of the expensive content' approach to it, instead. ~.^