"I want to know whatever I'll be better off knowing as someone who's going to move from my world to yours and then live there. You might know all that information but it would be hard for us to compare notes thoroughly enough to figure out that you do have toast and healers and you don't have skirmish or fae and so on for all potentially relevant phenomena - I can stand here going 'dwarves? a-mail? universities? paladins? lawyers? cats? trees?' all day, and you can do the same to cover the things you have that I might never have heard of, but it would be kind of a haphazard way to go about it. If the bar knows the relevant things already, she'll have a much easier time getting me up to speed."