They expect a business to pay all this before even having one customer? Must stifle enterprise hugely. Who's going to take a chance on paying that figure monthly when they don't even know if there will be one reply to their adverts?
Indeed, it's compulsory. But -
These sellers on street corners selling their gas lighters and spring onions paying 800 zl a month?
All those leaflets stuck to bus stops where you tear the phone number off, the owners paying 800 zl a month for the nail polishing or English lessons services?
The vast majority of those won't be officially registered. The black economy in Poland is huge - if everything is in cash, the taxman is unlikely to find out or care.
I'm surprised there's any enterprise here at all if that's the case.
The normal way of doing things seems to be not registering in the beginning while you build your business, then when you get to around 4000zl profit a month - registering then. ZUS is written off as a business expense, too.
It seems to me that the high costs are a way of forcing people into saving for their retirement - given the Polish attitude, many of them would spend today and never think about tomorrow.