Ms. Wright has already answered this question. Studies do indeed show that bigger fines act as a deterrent to committing such offences.
Many very important cases are resolved more easily and more quickly, thanks to directives, whether ministerial orders or other measures, which eliminate the need for court appearances. In most cases, we get the result desired, namely to end the offence or to avoid its happening again, without having to go to court. There are tools other than prosecution to enable us to achieve our objectives.