Mining profitability balancing between coins

[RentGPU]

As most of miners know mining calculators are alot and easy to use and calculate your profitability on diffrenet coins specially whatttomine calculator so why there is alot of difficulty on some coins than other i think they should auto balance in profitability , is this because there is alot of newbies that can't switch between coins , i am already doing this going to the lowest difficulty and thats the logic.