The credit rating agencies here mandatory swipe off 30/50 pts in the US for not using credit and I bet the same in Poland
Yes, and it's absolutely ridiculous.
The best rating would be a result of having multiple loans and paying them off on schedule, using credit cards regularly and having a generous overdraft limit. Then, thanks to your high credit rating, you can get another loan (with interest, provision, insurance etc.) and increase your cc and overdraft limits.
In other words, people are being rewarded with higher rating for being financial retards. :)
Of course, there are also people who fall behind with their installments, keep carrying the balance on cc making only minimum payments, and keep using their overdraft limits. Such cases are beyond retardation, but that's the trap so many fall into.