Is this legal?

I have never lived in an HOA neighborhood and never will. I understand why they came about but it has become a lawyers scam in most places from the stories I have heard. I had a customer a few months ago tell me they pay $250.00 a month to the HOA and the are around 300 houses into the community. That comes to at least $75k a month it collects overall or about $2500.00 per year from each household. I can see where or how they get that much benefit out of their property values by any means.