I obviously cant prove this, but after a certain point or if you have way too many objects on screen, I would bet tha many collisions arent counted properly anymore.
cause I was above 10 millions, with certain skills bought an insane amount of balls which brought my balance down to like 5 million (were 10k balls, someone gotta do the math).
and after almost all of them being done and gone I am somehow slightly below 10k.
so i didnt even make the money back, let alone increase it, despite that ball type claiming to bring a 25% profit when used.
so my guess is that the collision counting goes nuts when you have so many objects that the game starts to lag and all :-)
so going to 20 million will take longer since I have to use fewer objects at a time :-(
Nah, it was more a thing of "Hm, I have the money, so why not jsut spawn a ton of items at once and make money much faster"?
since in the end , depending on the used ball, you make 50% profit on the money you invest, so no point in doing it step by step since that is jsut wasted time.
dump it all in, have the balls extinguish their life, get 50% profit on that invested sum.
well, at least if there wasnt the issue with too many balls breaking the collision counter :-D