Because the game is mainly a human life simulation.
Many players won't like 4 occult game packs in a row.
They also need time to think about the best way to do it.
I don't agree at all, it's only recently it's become a "happy families simulator" with weirdness at the back. Sims 2 literally every expansion came with an occult life state... Weirdness and occult chaos has always been at the heart of the sims. Although I do agree I wouldn't have wanted just one occult game pack after the next, that would've been too much, but still it shouldn't be two and a half years between every occult pack
