EventBrite to offer referral fees

I have used EventBrite (ref) about half a dozen times to organize events.IT fils the need and has some good reports. I got an email today that they have started offering a referral fee for recommendations. Now EventBrite is free if the event itself is free. If you are charging for the event then there is fee per registration. What are the other event planning softare that are comparable? I know Jill Foster used Socializr for a DC Media Makers event. Are there new companies doing better things?