Tell them having the committee/strata manager taken to NCAT under a section 232(2) for failure to exercise their responsibilites under the Act looks even worse.
As a compromise, your strata manager could send out a general warning letter that rogue parking is in breach of the by-laws and failure to comply will lead to NTCs and possible fines. That’s one notice.
Prospective buyers will look more favourably on a scheme that has had a problem and dealt with it than one that’s clearly pretending there is no problem. I think your biggest issue may be that you have a lazy strata manager and/or committee.