I've flown for 33 years, both privately and commercially, in Oz and NZ, and never been ramp checked once.
I was, however, recently caught up in a radom maintenance audit that revealed that I had inadvertently flown an aircaft (as the sole occupant on private operations) on an number of occassions in the week after a mandatory AD (rudder pedal inspection) had become due.
As soon as I realised my error, I had the AD carried out - no faults were detected. Had I realised my mistake sooner I could have fudged the Maintenance Release, and then I would not have this story to tell.
I was threatened with up to
8 years gaol and
$20,000 in fines, but the matter was settled when I agreed to pay an "administrative fine" of $500.
...... but that's a whole other story.
I am sure that the
Cretins
Against
Safe
Aviation will now claim to have cleaned up the cowboy pilots in Nth Qld, in the wake if the LHR disaster!
Dr 
PS: The only blemish on a 33 yr record - if you exclude the 27 June 1979, when I forgot to cancel my sarwatch.