I'm a permit holder. Sometimes I need it, sometimes I don't and I generally park accordingly (I prefer shade to convenience).
And sometimes my able-bodied wife and chauffeur uses it to collect me. Readers/forum members without permits or permit-holders in the household who think that everyone displaying a permit should be visibly physically disabled need a reality check. It"s worth pointing out they are Parking Permits not driving permits.
Sure - some people abuse permits and the permit systems but they're outnumbered by others with no permit at all and no need for one but still choose to occupy a permit space when they nick into the newagent, go to the fish and chip shop or collect cash at the atm.
I'd miss my permit if I became ineligible but I'd much rather not need it at all.