Wax/sealant makes your car:
-look nicer
-easier to clean (dirt/dust sticks less)
-easier to dry (water blows right off with a blower)
-more resistant to bird poop and hard water etching
-more resistant to contamination (iron/brake dust and sap won't bond as easily)
Why you would not want any of these things is beyond me. But hey, its your car.
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