The insurance question is essentially an economic one:
What is the oppurtunity cost of having someone dead, what is the value of all the things they could have done if they were alive.
So the intial question is flawed in that the value that one person let us call them A, can render to various people varies.
For instance to their spouse B, they are the breadwinner so their value is their salary till retirement, the money saved by A doing stuff around the house so that a contractor doesn't have to be hired, the money saved by A giving a lift as opposed to B having to get a taxi, the cost to B for counselling to deal with A's loss. In addition to the emotional loss of a soulmate (which in my estimation can not be given a monetary value except insofar as the time that it takes to get over the loss can be valued).
In this way every of the 1 billion B's in the world will value their A to differing ammounts.
Further to this to the company (C) that A worked for their death represents a loss of investment in recruitment and training. And a loss of future revenue that may have been derived from their employment. A's value is also added to for C by the ammount it costs to replace A, by the lost productivity of a grieving workplace.
To As parents (P) A's loss is worth emotional grief etc as for B however in addition As loss is added to by how A would have been able to support them in old age and infirmity.
To the world the cost is what they might have done if they were alive, sure for cancer etc etc.
In short it is incredibly complex to determine the value of one persons existence, and there is no constant value as it varies with the loss to others that will be incurred by their death so it varies with circumstance - from here it would be possible to reach the sickening conclusion that the lives of the rich are worth more than those of the poor. So complex and morally dubious is the process of determining an approximate value that it precludes trying to except in the most rudimentary manner.
On the other hand the entire cost of obtaining all the chemicals (in the correct ammounts) that make up the human body is (from memory) under a $1. On the flip side we could value a person on how much it costs to manufacture a new one - currently an impossible feat though.