I think that's a good point - my very clear impression on my many visits to the US is that the quality of service is directly proportionate to the expectation of a monetary reward. Where there isn't a reward on offer, the service is much less impressive (such as on airlines and immigration/customs officials).
When I travel to Asia, I find the service to be superior to anywhere else in the world including the US (and many times more sincere) yet tips aren't generally expected - their incentive is the self-satisfaction of providing good service. It's rather sad that that attitude isn't widespread elsewhere.
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