Hello Mat,
Sorry for the delay. I was traveling and busy with work last week. So only now I can reply to you.
Part of the statistics that you are asking is in the statistics page.
There other statistics numbers that I can share you with more details privately because they are too sensitive to our company business, so we will not share them in public.
phpclasses.org/browse/statistics/st
...
Anyway, regarding the mission of finding 500 users of your packages, it depends more on the quality and relevance of your packages than on the site itself.
So we are going to implement a new initiative to encourage more developers to review your packages and tell you how you can improve the packages so they can attract more users.
I will share more about this privately with you and other developers that are helping us to improve the site so your work is loved and admired by more users.