There’s always gonna be these people knowingly breaking the law if they can easily afford the fines. Do you think she would keep driving without her seat belt and smoking wherever she pleases if she was fined say 10% of her yearly income every time she was caught?
Now, others have already explained that is a fine based on a days’ earnings (usually estimated from annual income). I’d like to add that implementing this for companies is why EU legislation like the GDPR is so fearsome.
If a company violates the GDPR badly enough¹ they can be fined up to 4% of their annual revenue or 20 million euros, whichever is higher. No matter what size that company is, that kind of fine hurts enough to be a deterrent. And suddenly everyone is very interested in following the law, even the guys with bigger budgets than some countries.
¹ Less egregious violations have halved max fines. Still enough to be really painful.