One observation I've made is that if I eat any food at an event, I am more likely to stick around and not bounce out if I think the speaker/topic/people are bor

One observation I've made is that if I eat any food at an event, I am more likely to stick around and not bounce out if I think the speaker/topic/people are boring. By eating the food that organizers have provided, psychologically I am committing to staying there and providing value in exchange for the food I provided. So, to maximize this effect, it makes sense to serve the lcd of foods; junk.