Companies storing and losing PII have a huge negative impact on the affected users, like e.g. credit card fraud or tax refund scams. This bears a huge actual cost to the victims, either because they never get back the stolen money, or because they need to invest significant time and expenses to fight for it.
A company trying to make money of my PII should better be prepared to handle it securely and to delete it upon request. Handling of GDPR requests must be calculated by them as part of the data handling expenses.
In both of these cases if the information is misused it has consequences for the individual, and (relatively) higher cost for the individual on minimum wage.
In the former, this can affect your future ability to find housing. This potentially leads to extraordinary stress.
In the latter the consequences again affect both wealthy and poor, but the person living hand to mouth faces much more serious consequences if their wages are adminstratively docked to pay for costs fraudulently registered in their name. Further, they're unlikely to be able to pay an expert to resolve this or take time out of work to do this themselves.
It is utterly unfair to compare subsidized access to an employment tribunal (potential harm: months of undeserved unemployment, loss of home and possessions; cost of investigation: spread across the entire nation's taxpayers) to almost-free access to your GDPR privacy report (potential harm: a little bit of mental discomfort; cost of investigation: borne by one organization, potentially ruinous for a small business or solo project).