(Or is it really more about traffic to the documentation site and thus eyeballs on the sales pitch?)
I'm making an app using ShadCN, which is pretty good and free -- maybe Tailwind Plus would be significantly better, I don't know, I had to consider the possibility that this project never makes any money so I wanted free for the first shot. And the LLMs turn out to know it pretty well.
Once I get it built using ShadCN, it's hard to imagine when I'd have time to go redo all the component hackery with another library, even if it were way better.
I guess my point is just that "paid UI components" is a really tough business when there are so many people willing to make components just for the fun/glory/practice. Same with a lot of UI stuff it seems -- I highly respect icon designers, but I'm probably just going to use Lucide.