Well I can make 200+K in a match where I run starter suits and die often, whereas I put my Min Commando and several assets on the line and receive less than 50K.

Guess it depends on score ratio with other players on the blue team.

From my understanding and previous explanations from a long time ago, it works something like this:

Your payouts are based on two things (a) time spent in match and (b) a dividend based off WP of total equipment destroyed in the match.

So basically you get X ISK for every Y seconds spent in the match, but more importantly the dividend pay is based on your number of warpoints relative to the rest of the team. That percentage is then taken from the total amount of equipment and vehicles destroyed in the match. That's what creates the huge disparities in pay.

You would get a higher pay if, say, you got 3000 warpoints and the next highest player had 500 warpoints versus if you had the same and the next highest was 2500 warpoints. But then again, say in one match you get 3000 and the next highest is 2500 but in that match it was nothing but proto suits and tanks destroyed, you would get a much higher pay regardless than if in the first match (3000 vs 500 WP) it was nothing but militia suits being destroyed. See what I'm saying?