Why is scaled_wealth completely random when exported to a variable?

[faiuwle]

So I was having trouble getting the game to calculate a year's worth of income using scaled_wealth, so I did a little experiment. I wrote the following event:

character_event = {
    id = AFRREL.013
    is_triggered_only = yes
    
    immediate = {
        export_to_variable = { which = variable_one value = scaled_wealth }
        export_to_variable = { which = variable_two value = yearly_income }
    }
    
    option = {
        name = some_option
        wealth = variable_one
    }
    option = {
        name = other_option
        wealth = variable_two
    }
    option = {
        name = true_scaled_wealth
        scaled_wealth = 1
    }
}

The result of triggering this in-game:

I reloaded the game several times as this character, and in every case it was the same. I started a new game as a different character with a very similar yearly income, and triggered the event:

So it seems to be completely random, based on whatever random generation happens at the beginning of the game. I've also seen times when scaled_wealth was much greater than yearly_income. You can test this out in your own game and see for yourselves. So, what is the purpose of scaled_wealth exported to a variable, and why does it seem to basically be a random number generator?