The magic number.
Some people would say it is eight, after all, the future of civilization is eight with that magic 8 ball. Who denies this? I recall some Schoolhouse Rock cartoon that identified the magic number. I can’t recall what it was, perhaps two? Seven seems to be a popular magic number. A lot of people think it is lucky. A lot of people also thought the pet rock was a worthwhile investment back in the ’70s.
1,000 is the magic number for a lot of vendors. It is the cut-off if you will. There are vendors that unless you have a minimum of 1,000 end-users (regardless if they are employees, customers, etc.) are not interested.
I know of vendors who will go below 1,000, but their “sweet spot”, the number they really would prefer is a minimum of 1,000.