Hi Frank,
Thanks for reaching out, and I’m so sorry for the confusion here! The “10 sites” indicated for our Event Aggregator license types refers to the number of WordPress sites that each EA license can be activated on. There is no limit to the number of URLs that you can import from–you’re only limited by the number of import jobs that you can make in a single day, as specified by your license type. For example, the most basic Event Aggregator license tier allows for up to 100 imports per day, but these imports can come from any number of unique URLs, and there’s no limit to the number of events that can be brought in during a single import job.
I hope that helps to clarify things a bit! Thanks again, and let us know if you should have any other questions!