The main area of concern is that money is a big factor, you think from a criminal mindset that robbing banks, robbing players, robbing vaults etc has value to gameplay however meaning the amount is ridiculously low and not enough to supplement the average criminal expenses. The expenses are things like your bail time, reclaim confiscated ammo bill, calling flares, modification to vehicle armour, tyres, and all other necessary repairs. The equation amount just utterly outweighs the money gained when being a criminal that's why your right with the expenses being lowered/balanced out. Realistically speaking it should just be super cheap and equal for every civilian.
Practically speaking in order for this to even work there has to be a mature balance between cops and robbers because it makes no sense having few cops against thousand of criminals, this would just weaken the defense mechanism of a cop resulting in rage quit and a defeat mindset.
Honestly don't think cop having to pay for the expenses would make sense because end of the day players choose to become a cop cause it's free and everything given is zero cost. That's why they enjoy the benefits of unlimited spawn, cheap ammo, call any car you want and even medical expenses paid by the public.
The ranking system does not make sense too me because I understand that if you want a cop to rank up to new levels, let's say new abilities to do certain new things sure why not as this would encourage cops to rank up a new style system of your choice.
