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Any change to the desgin, layuot and geomerty of a car's suspension will increase wear on the weaker componets.
The suspension is designed with certain peramiters.
ie: A POT HOLE - The factory tire will absord a certain abount of the 'impact' given the reccomended inflation from the factory. Making the tire "harder" reduces the amount of impact that the tire will 'cushion'. Thus the next componet (bushings & shocks) absorb more than they are designed to normally absorb.
THis is very simpistic but........
If you drive older cars or tend to keep a car forever, this tends to matter over time.
I have 200,000 miles on my Infiniti Q45. And I drive about 40k a year. I plan to keep it another 100,000. I tend NOT to get over excited about pushing peramiters to the limit. I like to find a happy medium. When I am going on a trip longer than 100 miles, I will go to 47 (hot) psi. The rest of the time I stay at 38-41psi.
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