Not to defend everything Meetup does, but conference registration is not really what the site is intended for.
Your usage pattern unfortunately just happened to look quite a bit like that something that they may think poisons the dynamic (recurring meetups of people with shared interests, not mainly driven by an organizer's self-interest) they are trying to create with the site.
I'm not saying your event was exactly pure self interest or bad in any way, it just isn't something that to them looks healthy for their site. And it doesn't fit the intent of meetup.
The fact that you had a poor description is the final problem here that leaves me feeling little sympathy. Every project, conference, etc. should have a clear description provided by the creator, at least if they want it to be well received. Maybe that's a lesson learned.
Your usage pattern unfortunately just happened to look quite a bit like that something that they may think poisons the dynamic (recurring meetups of people with shared interests, not mainly driven by an organizer's self-interest) they are trying to create with the site.
I'm not saying your event was exactly pure self interest or bad in any way, it just isn't something that to them looks healthy for their site. And it doesn't fit the intent of meetup.
The fact that you had a poor description is the final problem here that leaves me feeling little sympathy. Every project, conference, etc. should have a clear description provided by the creator, at least if they want it to be well received. Maybe that's a lesson learned.