I have got another idea about the test, but I am too lazy to try it, well maybe tonight
Mod the events file to one event, maybe just with planet conditions or value impact.
Set up 20 races,10 planets,player logs on, human control and without switching to AI control, means they would do nothing which could disturb the statistics. Let them build the shrines, 4 of them with -1000, 4 of them with -500, and so forth. And then I would do the coffee-mug-trick with function key F12, see
coffee-mug