I don't know about you, but on that income I would certainly not brush off such a fine as a "cost of doing business". Would it cause me financial trouble, or would it force me to sacrifice other expenses? Absolutely not. But would I feel frustrated at having to pay it, feel stupid for my mistake, and do my best to avoid it in the future? Absolutely yes.
There isn't a trend of increasing fines, nor has any fine even reached the cap, let alone applied multiple times for the recurring violations. Even more with the current US administration's foreign policy towards the EU.
While GDPR as a law is fine, with the exception of enforcement limitations, enforcement so far has been a complete joke.