If it were true as AdriaanvRossum said above that Simple Analytics data has "no identifiers" (taking that at face value for now) then that seems exactly analogous to those cash transactions someotherperson describes.
Simple Analytics absolutely does receive identifies (namely IP address). They claim they do not store these address, but that depends entirely on trusting them and their closed source software.
This is very unlike the accounting firm, which never receives any identifying for cash transactions and thus couldn't store it even if they wanted to.
