Welcome Groovacious. It’s a brave new world here.:-) Please keep questions about a particular library with it’s listing. In this case Audiosparx questions would go here https://musiclibraryreport.com/a-to-a/audiosparx/.
50styles has been around for a long time, in this market, is well established and I believe in his previous posts he stated he’s making about $20k a year at AS (search 50Styles). AS has different license fees depending on use.
I believe AS now has about 500,000 tracks so it’s harder to hit those numbers starting out.