Re: Why are so many business not verified ?
A lot of business owners don't even know they have a listing. Google doesn't just ask business owners after all... they check all over the place, and create listings for all the businesses they think exist. Did you incorporate? Google sees your business record in the secretary of state business database. Are you on facebook? Google sees that. Yellow pages? Yelp? Etc. etc. etc. If you're curious, here's a map of what the experts think Google keeps an eye on in the US when learning about businesses that may or may not exist:
You can imagine too that that causes problems if some of those sources have mismatched information about your business... a business owner might end up with one verified listing, and another unverified listing they don't even know about with the wrong name, address, or phone number.