it's because people only compare to their own - mainly hand-crafted and self written - websites. they don't think about under which conditions a huge number of pages could arise. every site with several hundred thousands of pages must be spam, right?
one of my sites is an event database. i push about 2,000 articles per month = 24,000 per year = 120,000 in five years. add loads of user generated content. maybe now again combine these in some senseful manner. see? that's only one example. others are imaginable.
well ok, 29.5 million for a new site is yet a different matter.. that sounds indeed spammy.
[edited by: moTi at 1:31 pm (utc) on Sep. 13, 2007]