And also not everybody continues their policy till the end, either they see no need the policy anymore so stop paying, or no money to continue paying premium and forced to stop. So the money the insurance company built up in anticipation of paying the claim can be pocketed.
Some of the policies are meant to lock up your money till maturity. Meaning you bobian have to pay and pay or surrender at a loss.
These policies are the ones with high comms which agents like to sell.