event payments with marketpress & membership

I am creating an event and asking for it to use the membership pricing, but the event is still calling the only event gateway which is paypal.
Why isn't it calling the membership gateway for authorize.net , etc. ?
I would use the maretpress link but event won't type multiple events to the same marketpress product.
I think this is a real short-coming of event as paypal is not what any corporate customer would use for professional courses that we offer.