Updates and Connections between packs
I feel like there are great opportunities to create unique connections between packs that are being missed. Creating these connections would be synergistic and would increase sales.
Here's an example:
We now have a royalty pack. It would have been cool if you'd added an update to Crystal Creations that if people have both Crystal Creations and Royalty and Legacies, sims can now make custom tiaras at the gemology table. Perhaps adding bejeweled swords or decorative daggers.
I made this suggestion to my friend and she was immediately like, "OH MY GOD! I would have bought both packs immediately just for the chance to have tiaras with custom gems and metal combos."
There are multitudes of other synergies that could be identified. Anyone have some they'd like to share?