I guess it depends on what your price range is. For most people starting out, the price range is generally less than $1M. At that price, you will generally only have townhouses or condos available to you, which will generally have HOAs. It sounds like the properties you have been looking at are more akin to "multi-tenant" units in which it is much easier for all owners to collaborate. The properties I'm referring to are those with many more units, and in these communities, an official HOA is usually already set in place long before the first unit was purchased (agreement already set with the builders).
That said, I should probably qualify my original comment with "Bay Area within 1 hour of typical office locations in the Bay Area on typical rush hour commute". Here, "typical office locations" will include San Francisco County, San Mateo County, and Santa Clara County. This then limits your property locations to San Francisco County, San Mateo County, Santa Clara County, and Alameda County. In _these_ locations, $1M can generally only get you a condo or townhouse with many units (at least the last time I checked).