I've been to some HOA meetings. I think it's more likely that there's no consensus than that people agree that the park was improved. Even if the organizer did their best and spent a thousand bucks on supplies. There's no way to "make everyone whole again". Or maybe a majority of neighbors just aren't good people and realize they can get a nice park and their money back just by voting "no" as a bloc. All the fancy number theory hasn't really achieved anything.