Having not totally read everything, I agree!!!
The questions implies that closing fees may be state-mandated, like, say, fees paid to Executors, and that is not the case.
Fees do vary because the components that make the fees up vary. There are things that have to paid in order to close, stuff like resort maintenance fees, resort transfer fees, rip-off resort fees purporting to collect a commission, recording fees, taxes, and the actual fee for doing the service.
Then, since the closing company typically ecrows money going to the seller, that is added to the closing costs.
You can find closings for $200-$250 that include recording fees. The high end depends on how much else needs to be paid for the miscellaneous stuff. If a person has not paid resort fees, and penalties have been added, it could get fairly high.