I don’t mind paying to help out an organizer. But… Meetup has been hacked enough times in the past that I’m not going to give them credit card information. Some Meetups require an annual membership fee, which I still don’t mind paying, but again I’m not giving Meetup my credit card information. I think an annual membership fee is a better option, as that way organizers can use any extra cash generated to offset costs. They do a lot, and I would rather they get the money than Meetup.