just got in from having my $10(!) smog test done here ...
it's pretty clear to me that they run a $9.99 smog as a super-cheapie (if not loss leader) so they can check out your vehicle and find stuff wrong where they can actually make some real money.
i took the immaculately well-maintained continual car in (google it if you're curious) ... they IMMEDIATELY did the test (passed) and they did a very extensive once over.
"your car looks great! the fluids are right. the brakes are good. it's in great shape."
which is completely right.
the staff was friendly, helpful and super-courteous ... even though i came stumbling in looking like i'd had a long friday night bender (which i had).