The idea behind this meetup is to provide a convenient spot off of the Brooklyn ended N&R Train for people to meet and make new friends. It's also intended to be a somewhat low key thing with only couple dozen people. That way you're sure to actually be included in the conversation.
This group ins't run by a club promoter or anyone looking to make a random buck. If you're familiar with other groups in NYC, it can be pretty annoying to see RSVPs showing 4 actual people and a head count of 200. It also can be annoying to see a 25$ admission fee for the privilege to purchase $10 drinks. We are not that. That said, if you're hell bent on showing your gratitude to the organizer of the event your at, a drink for the organizer or round of shots for everyone says is all :)
Lastly, come on out and have fun! Its the name of the game.