I'm going to complicate things slightly. Here are some hypothetical packs and values.
- Pack A: Fire Pet, Fire Portal, Fire Cape and points. ($20)
- Pack B: Ice Pet, Ice Portal, Ice Cape and points. ($40)
- Pack C: Void Pet, Void Portal, Void Cape and points. ($60)
So the Void pack is significantly more flashy, vfx heavy and just over the top compared to the lower packs. Maybe it has special animations on the cape and some random event that has some sound effect or something. Then, if we sell the packs for cumulative price with a discount for bulk maybe it looks something like this instead.
- Pack A: $20
- Pack A+B: $50
- Pack A+B+C: $100
Now, with this structure, if you're just after the Void pieces, that'll cost you $100. If they didn't bundle together though, you'd only need $60. So for people looking to make more specific purchases without the extra stuff, the smaller bundles are better. For someone who is just going to buy it all anyways, the big bundle packs are better.
We get feedback from both types of players that they hope we do it each way. Personally I think both is the way to go but you have to be so careful when adding any sort of incentive to spend more money at all. Even something as simple as "bundle pack = better value".
edit: just to be super clear, I made up all those packs and prices as examples specifically so the numbers played nicely in this example.