Yeah, I bought the panel too - all they tell you is to go emulate stuff yourself. But I think they include licensed games when you buy the cabinet to entise you since it's such a rip-off.
I've wondered how they are doing it also, as I can't image all of those companies wanting to sell rom images or simillar. Would love to hear from someone who has this collection to get their opinions. It's also VERY possible this topic has been talked to death, but this was on the front page so what the heck.