Google is ranked #1 and gets about 1,470,000,000 visits a day. Facebook is ranked #2 and gets around 952,000,000 per day. Amazon #3 at 153,000,000 per day. WebmasterWorld is ranked 672 with an estimated 1,863,839 per day.
Depends on the site. If your focus is selling top-end real estate, custom-built yachts or similar, you may get along quite nicely on one page view per day ;) It just has to be the right view.
What line of business are you in, that you can get 100,000 human visitors without creating work for more than one person? Doesn't have to be commerce. At that level you start having to answer e-mail and monitor postings and, well, general housekeeping.
WebmasterWorld may not have any "employees" as such, but I'll bet it takes a lot of uncounted person-hours to keep it going.
You asked about number of pageviews - number of unique visitors is more relevant.
I would say reaching 1 million uniques a month could be considered fairly big for a one person operation. If this is about how much money you'll be making it really depends on what type of website you have. Some verticals will make you more than enough with much less traffic.
If page views alone were the answer then why do so many forum boards earn relatively so little in comparison to their traffic levels?
If one is in a niche market like myself then there is inevitably a limit as to traffic volume, sure I do have have competition but nothing like the amount of competition for the huge traffic popular subjects and it's very doubtful these days whether a one-man band could achieve this.
If you are in even a half-decent area then 100k page views a day should more than feed the family. If one person can feed and look after his family on a couple of websites then they are "big" - by one person standards anyway.
But don't work on page views, unless you have an insatiable desire to be called "big". Work out what you need to earn for the family and go onwards from that point.
I treat page views as a secondary input for various optimisation purposes not as a major signal. I would rather know the following: * unique human (filter bots or number is near useless) visitors per period, * returning visitors per period, * conversion percentages and revenue for both by page and category.
Big is relative. Set a goal, meet it, set a bigger goal...