I believe playlists don't count as library (please correct me if I'm wrong) - so you can effectively surpass the 10,000 as a limit by adding songs to playlists instead of the library.
I've actually changed my model primarily around playlists and don't actually use the library feature of spotify hardly at all.
I've actually changed my model primarily around playlists and don't actually use the library feature of spotify hardly at all.