First of all congratulations on your plugin. After a bit more testing, I will definitely buy the Pro version, you deserve it.
I have a site that enables bars and discotheques to post their events. As far as I can see, there isn't really a RSVP option when using Event Manager. There is a booking option, with tickets. Once your booking request is approved, an "attending" rsvp is added to the activity stream in Buddypress.
As we are talking about real tickets, a payment option should be available as well. And your Pro version offers that kind of option using Paypal.
It would be less than desirable that my personal Paypal would receive all the payments for all the events. Currently though, this is the only option. Would it not be a good idea to have a custom field for groups where they can input their paypal credentials? (and have a check performed on whether they have the right settings).
This would require Event Manager to be able to work with several paypal accounts, but I don't think it is that much work to implement, especially with regard to the flexibility you get in return.
What do you guys think? Or am I forgetting an option?