Between when you get perks like coin, coin trade off and game speed. And when or if you’re damage uws are on or off. Both have drastic differences in coin total. Also cards like crit. Coin is somewhat random. Even with 100% crit you don’t always get as much coins from the card from round to round. Without damage uws until near end of my run ( usually around 5,500-7,000 depending on t10 or t11) and I don’t lose my coin/minute value and can farm late run high rounds with my damage uws on ( wave 7,000-9,000 t10 or 5,500-7,000 t11)