The same thing is true with lists (listicles) of principles or rules that are even (or lucky) numbers. If somebody is advocating 5, 7, 10, or 20 principles for doing something, I assume at best that they added or dropped marginal ones to get the round number, and at worst that they just had a remit to do 10 rules for something and were just winging it.
The funny thing is that the name 37 signals comes from a count of the signals from space have unexplained origins. So they picked their name long before they came up with that list that just happens to fit. (With one extra by starting at 0)
