Depends on one's definition of "collector." I would not be surprised to learn that 200,000,000 people have at least one coin set aside, thinking they'll be rich one day. Almost everybody has one or more
State Quarters, for example.
I wouldn't call these people "collectors" in the truest sense of the word, since they, for the most part, are incredibly naive about coins and what makes coins valuable.
I spent lunch hour at the coin shop that I frequent. The owner was talking about an antiques and collectibles auction held in Mandan over the weekend. Apparently common date silver dollars were selling for $200+. Absolutely crazy...but those buyers would be called "collectors" by HSN and others.
Another fellow came in while I was at the shop and wanted to sell his "valuable" quarters...some common silver Washingtons and a couple of AG Barbers. He was offered wholesale silver prices, but decided to "hang on" until the value goes higher. He was talking "collectors' value" not spot silver!
He really seemed put out that he wasn't offered a couple of hundred dollars, and he was not listening to the owner's explanation of what makes some coins very valuable, and why others have no value other than bullion price.
Oh, well...