It takes a certain skill and a lot of time to make packs.
Instead games like Pandorium are clearly super popular these days, judging by all the support they get (see their patreon).
I love PF of course, but the moment Xela decided to switch to simpy to simulate business, customers and other stuff he became the only person who can finish the core. And he's offline 3rd week already.
No other renpy game uses it, and for a good reason: it's too complex for gaming. But Xela likes complex tasks way too much, up to the point of using complexity for the sake of complexity.
For instance, out of 33 currently existing H-scenes in GiBC I made 32. He made only one, but it's based on extremely complex coding
If I decide to finish PF on my own, it would take a few months only to get rid of simpy part.