I would safely say the "very costly" means the insurers and bankers expend money to comply with the regulations.
With that being the case, consider the following:
SUPREME COURT OF THE UNITED STATES
No. 98963 JEREMIAH W. (JAY) NIXON, ATTORNEY GENERAL OF MISSOURI, et al., PETITIONERS v. SHRINK MISSOURI GOVERNMENT PAC et al.
ON WRIT OF CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE EIGHTH CIRCUIT
[January 24, 2000]
Justice Stevens, concurring.
"...therefore, I make one simple point. Money is property;"
Amendment V
"nor shall private property be taken for public use without just compensation."
If I was the CEO of an "insurers and bankers" I would quit complying with the regulations until my institution was compensated for the taking for the public use because otherwise the regulations are unconstitutional.