But also at the same time, I don't think the intention behind Kits is to get everyone to buy all three and make up a lackluster stuff pack, especially since the themes don't go together at all. But rather to allow people to pick and choose what they want.
I mean, not everybody actually plays the game. Some people just design Sims and others do nothing but build, and Kits are great for those kinds of players, which I think is possibly part of the reason behind splitting things up.
Yes, it's still to make money too, but that's kind of why companies exist. And yes I agree, Kits could be cheaper and that this grouping could have been included in other packs, but if the reason was truly to split up stuff packs, don't you think all three of these themes would have been connected in a very obvious way?