You can contract your own services, why would you need a middleman? To have a master HOA sub contract the services out would be a logistical nightmare. I live in a gated HOA in Naples, Fl for 8 months comprising 1234 homes, this is broken up into several communities with separate HOA'S , I happen to be in one that has 83 homes, we contract our maintenance services for landscaping, pool maintenance, homepainting. roofing etc.  for our 83 home community. We also pay a master HOA assessment for the Country Club, tennis, resort pool, bocce, golf course etc . The community is bundled golf which means that the golf membership is deeded with the property. If you are not a golfer or decide not to golf anymore you still pay the golf membership. Ocean Pines is a bargain when you look at assessments here and being able to chose what amenities you want to participate in.