This format definitely detracts from the total benefit these companies can get from these office hours, but the possible press from getting their idea vetted by

This format definitely detracts from the total benefit these companies can get from these office hours, but the possible press from getting their idea vetted by you on stage somewhat compensates for not being able to ask the pressing questions that usually come up at OH. My one question would be: can you be as brutally honest as you need to be on stage with a team you've never seen before and might never see again? If so, then I think this is still an invaluable experience for the companies - most startups that just get feedback from their friends and a few early adopters don't get to hear the things that they need to.