Hi, Jason. Thanks for your interest in our plugin suite.
We don’t have this functionality, but we do have the option to restrict buying to logged-in users.
If you use WooCommerce, one of their extensions for user-based pricing might play nicely with this option of ours, but we don’t guarantee support with any of them, per https://theeventscalendar.com/knowledgebase/compatibility-with-woocommerce-extensions/
Last but not least, we have Bundles and a pretty great Refund Policy so you can buy one or many of our add-ons and thoroughly test them.
I hope this info helps. Let me know if you have any follow-up questions.