We do! Once you're on a paid JoeLister plan, you will see a special referral link on your "Settings > Advanced Settings" tab. You can share that link, and if another customer signs up for a JoeLister paid plan using your link, you'll be credited as the referrer and earn $50 towards your JoeLister account usage!
Here's an example of where you can find your referral link in your Advanced Settings in JoeLister: